import unittest import sys from mpu import MPU class MPUTests(unittest.TestCase): # ADC Absolute def test_adc_bcd_off_absolute_carry_clear_in_accumulator_zeroes(self): mpu = MPU() mpu.a = 0 mpu.memory[0x0000:0x0002] = (0x6D, 0x00, 0xC0) #=> $0000 ADC $C000 mpu.memory[0xC000] = 0x00 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(0, mpu.flags & mpu.CARRY) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) def test_adc_bcd_off_absolute_carry_set_in_accumulator_zero(self): mpu = MPU() mpu.a = 0 mpu.flags |= mpu.CARRY mpu.memory[0x0000:0x0002] = (0x6D, 0x00, 0xC0) #=> $0000 ADC $C000 mpu.memory[0xC000] = 0x00 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x01, mpu.a) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) self.assertNotEquals(mpu.CARRY, mpu.flags & mpu.CARRY) def test_adc_bcd_off_absolute_carry_clear_in_no_carry_clear_out(self): mpu = MPU() mpu.a = 0x01 mpu.memory[0x0000:0x0002] = (0x6D, 0x00, 0xC0) #=> $0000 ADC $C000 mpu.memory[0xC000] = 0xFE mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0xFF, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.CARRY) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_adc_bcd_off_absolute_carry_clear_in_carry_set_out(self): mpu = MPU() mpu.a = 0x02 mpu.memory[0x0000:0x0002] = (0x6D, 0x00, 0xC0) #=> $0000 ADC $C000 mpu.memory[0xC000] = 0xFF mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x01, mpu.a) self.assertEquals(mpu.CARRY, mpu.flags & mpu.CARRY) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_adc_bcd_off_absolute_overflow(self): mpu = MPU() mpu.a = 0xFF mpu.memory[0x0000:0x0002] = (0x6D, 0x00, 0xC0) #=> $0000 ADC $C000 mpu.memory[0xC000] = 0xFF mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0xFE, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(mpu.OVERFLOW, mpu.flags & mpu.OVERFLOW) self.assertEquals(0, mpu.flags & mpu.ZERO) # ADC Zero Page def test_adc_bcd_off_zp_carry_clear_in_accumulator_zeroes(self): mpu = MPU() mpu.a = 0 mpu.memory[0x0000:0x0001] = (0x65, 0xB0) #=> $0000 ADC $00B0 mpu.memory[0x00B0] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(0, mpu.flags & mpu.CARRY) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) def test_adc_bcd_off_absolute_carry_set_in_accumulator_zero(self): mpu = MPU() mpu.a = 0 mpu.flags |= mpu.CARRY mpu.memory[0x0000:0x0001] = (0x65, 0xB0) #=> $0000 ADC $00B0 mpu.memory[0x00B0] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x01, mpu.a) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) self.assertNotEquals(mpu.CARRY, mpu.flags & mpu.CARRY) def test_adc_bcd_off_absolute_carry_clear_in_no_carry_clear_out(self): mpu = MPU() mpu.a = 0x01 mpu.memory[0x0000:0x0001] = (0x65, 0xB0) #=> $0000 ADC $00B0 mpu.memory[0x00B0] = 0xFE mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0xFF, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.CARRY) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_adc_bcd_off_absolute_carry_clear_in_carry_set_out(self): mpu = MPU() mpu.a = 0x02 mpu.memory[0x0000:0x0001] = (0x65, 0xB0) #=> $0000 ADC $00B0 mpu.memory[0x00B0] = 0xFF mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x01, mpu.a) self.assertEquals(mpu.CARRY, mpu.flags & mpu.CARRY) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_adc_bcd_off_absolute_overflow(self): mpu = MPU() mpu.a = 0xFF mpu.memory[0x0000:0x0002] = (0x65, 0xB0) #=> $0000 ADC $00B0 mpu.memory[0x00B0] = 0xFF mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0xFE, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(mpu.OVERFLOW, mpu.flags & mpu.OVERFLOW) self.assertEquals(0, mpu.flags & mpu.ZERO) # ADC Immediate def test_adc_bcd_off_immediate_carry_clear_in_accumulator_zeroes(self): mpu = MPU() mpu.a = 0 mpu.memory[0x0000:0x0001] = (0x69, 0x00) #=> $0000 ADC #$00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(0, mpu.flags & mpu.CARRY) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) def test_adc_bcd_off_immediate_carry_set_in_accumulator_zero(self): mpu = MPU() mpu.a = 0 mpu.flags |= mpu.CARRY mpu.memory[0x0000:0x0001] = (0x69, 0x00) #=> $0000 ADC #$00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x01, mpu.a) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) self.assertNotEquals(mpu.CARRY, mpu.flags & mpu.CARRY) def test_adc_bcd_off_immediate_carry_clear_in_no_carry_clear_out(self): mpu = MPU() mpu.a = 0x01 mpu.memory[0x0000:0x0001] = (0x69, 0xFE) #=> $0000 ADC #$FE mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0xFF, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.CARRY) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_adc_bcd_off_immediate_carry_clear_in_carry_set_out(self): mpu = MPU() mpu.a = 0x02 mpu.memory[0x0000:0x0001] = (0x69, 0xFF) #=> $0000 ADC #$FF mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x01, mpu.a) self.assertEquals(mpu.CARRY, mpu.flags & mpu.CARRY) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_adc_bcd_off_immediate_overflow(self): mpu = MPU() mpu.a = 0xFF mpu.memory[0x0000:0x0001] = (0x69, 0xFF) #=> $0000 ADC #$FF mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0xFE, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(mpu.OVERFLOW, mpu.flags & mpu.OVERFLOW) self.assertEquals(0, mpu.flags & mpu.ZERO) # ADC Absolute, X-Indexed def test_adc_bcd_off_abs_x_carry_clear_in_accumulator_zeroes(self): mpu = MPU() mpu.a = 0x00 mpu.x = 0x03 mpu.memory[0x0000:0x0002] = (0x7D, 0x00, 0xC0) #=> $0000 ADC $C000,X mpu.memory[0xC000 + mpu.x] = 0x00 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(0, mpu.flags & mpu.CARRY) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) def test_adc_bcd_off_abs_x_carry_set_in_accumulator_zero(self): mpu = MPU() mpu.a = 0 mpu.x = 0x03 mpu.flags |= mpu.CARRY mpu.memory[0x0000:0x0002] = (0x7D, 0x00, 0xC0) #=> $0000 ADC $C000,X mpu.memory[0xC000 + mpu.x] = 0x00 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x01, mpu.a) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) self.assertNotEquals(mpu.CARRY, mpu.flags & mpu.CARRY) def test_adc_bcd_off_abs_x_carry_clear_in_no_carry_clear_out(self): mpu = MPU() mpu.a = 0x01 mpu.x = 0x03 mpu.memory[0x0000:0x0002] = (0x7D, 0x00, 0xC0) #=> $0000 ADC $C000,X mpu.memory[0xC000 + mpu.x] = 0xFE mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0xFF, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.CARRY) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_adc_bcd_off_abs_x_carry_clear_in_carry_set_out(self): mpu = MPU() mpu.a = 0x02 mpu.x = 0x03 mpu.memory[0x0000:0x0002] = (0x7D, 0x00, 0xC0) #=> $0000 ADC $C000,X mpu.memory[0xC000 + mpu.x] = 0xFF mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x01, mpu.a) self.assertEquals(mpu.CARRY, mpu.flags & mpu.CARRY) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_adc_bcd_off_abs_x_overflow(self): mpu = MPU() mpu.a = 0xFF mpu.x = 0x03 mpu.memory[0x0000:0x0002] = (0x7D, 0x00, 0xC0) #=> $0000 ADC $C000,X mpu.memory[0xC000 + mpu.x] = 0xFF mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0xFE, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(mpu.OVERFLOW, mpu.flags & mpu.OVERFLOW) self.assertEquals(0, mpu.flags & mpu.ZERO) # ADC Absolute, Y-Indexed def test_adc_bcd_off_abs_y_carry_clear_in_accumulator_zeroes(self): mpu = MPU() mpu.a = 0x00 mpu.y = 0x03 mpu.memory[0x0000:0x0002] = (0x79, 0x00, 0xC0) #=> $0000 ADC $C000,Y mpu.memory[0xC000 + mpu.y] = 0x00 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(0, mpu.flags & mpu.CARRY) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) def test_adc_bcd_off_abs_y_carry_set_in_accumulator_zero(self): mpu = MPU() mpu.a = 0 mpu.y = 0x03 mpu.flags |= mpu.CARRY mpu.memory[0x0000:0x0002] = (0x7D, 0x00, 0xC0) #=> $0000 ADC $C000,Y mpu.memory[0xC000 + mpu.y] = 0x00 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x01, mpu.a) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) self.assertNotEquals(mpu.CARRY, mpu.flags & mpu.CARRY) def test_adc_bcd_off_abs_y_carry_clear_in_no_carry_clear_out(self): mpu = MPU() mpu.a = 0x01 mpu.y = 0x03 mpu.memory[0x0000:0x0002] = (0x79, 0x00, 0xC0) #=> $0000 ADC $C000,Y mpu.memory[0xC000 + mpu.y] = 0xFE mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0xFF, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.CARRY) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_adc_bcd_off_abs_y_carry_clear_in_carry_set_out(self): mpu = MPU() mpu.a = 0x02 mpu.y = 0x03 mpu.memory[0x0000:0x0002] = (0x79, 0x00, 0xC0) #=> $0000 ADC $C000,Y mpu.memory[0xC000 + mpu.y] = 0xFF mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x01, mpu.a) self.assertEquals(mpu.CARRY, mpu.flags & mpu.CARRY) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_adc_bcd_off_abs_y_overflow(self): mpu = MPU() mpu.a = 0xFF mpu.y = 0x03 mpu.memory[0x0000:0x0002] = (0x79, 0x00, 0xC0) #=> $0000 ADC $C000,Y mpu.memory[0xC000 + mpu.y] = 0xFF mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0xFE, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(mpu.OVERFLOW, mpu.flags & mpu.OVERFLOW) self.assertEquals(0, mpu.flags & mpu.ZERO) # ADC Zero Page, X-Indexed def test_adc_bcd_off_zp_x_carry_clear_in_accumulator_zeroes(self): mpu = MPU() mpu.a = 0x00 mpu.x = 0x03 mpu.memory[0x0000:0x0001] = (0x75, 0x10) #=> $0000 ADC $0010,X mpu.memory[0x0010 + mpu.x] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(0, mpu.flags & mpu.CARRY) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) def test_adc_bcd_off_zp_x_carry_set_in_accumulator_zero(self): mpu = MPU() mpu.a = 0 mpu.x = 0x03 mpu.flags |= mpu.CARRY mpu.memory[0x0000:0x0001] = (0x75, 0x10) #=> $0000 ADC $0010,X mpu.memory[0x0010 + mpu.x] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x01, mpu.a) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) self.assertNotEquals(mpu.CARRY, mpu.flags & mpu.CARRY) def test_adc_bcd_off_zp_x_carry_clear_in_no_carry_clear_out(self): mpu = MPU() mpu.a = 0x01 mpu.x = 0x03 mpu.memory[0x0000:0x0001] = (0x75, 0x10) #=> $0000 ADC $0010,X mpu.memory[0x0010 + mpu.x] = 0xFE mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0xFF, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.CARRY) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_adc_bcd_off_zp_x_carry_clear_in_carry_set_out(self): mpu = MPU() mpu.a = 0x02 mpu.x = 0x03 mpu.memory[0x0000:0x0001] = (0x75, 0x10) #=> $0000 ADC $0010,X mpu.memory[0x0010 + mpu.x] = 0xFF mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x01, mpu.a) self.assertEquals(mpu.CARRY, mpu.flags & mpu.CARRY) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_adc_bcd_off_zp_x_overflow(self): mpu = MPU() mpu.a = 0xFF mpu.x = 0x03 mpu.memory[0x0000:0x0001] = (0x75, 0x10) #=> $0000 ADC $0010,X mpu.memory[0x0010 + mpu.x] = 0xFF mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0xFE, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(mpu.OVERFLOW, mpu.flags & mpu.OVERFLOW) self.assertEquals(0, mpu.flags & mpu.ZERO) # ADC Indirect, Indexed (X) def test_adc_bcd_off_indirect_indexed_carry_clear_in_accumulator_zeroes(self): mpu = MPU() mpu.a = 0x00 mpu.x = 0x03 mpu.memory[0x0000:0x0001] = (0x61, 0x10) #=> $0000 ADC ($0010,X) mpu.memory[0x0013:0x0014] = (0xCD, 0xAB) #=> Vector to $ABCD mpu.memory[0xABCD] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(0, mpu.flags & mpu.CARRY) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) def test_adc_bcd_off_indirect_indexed_carry_set_in_accumulator_zero(self): mpu = MPU() mpu.a = 0 mpu.x = 0x03 mpu.flags |= mpu.CARRY mpu.memory[0x0000:0x0001] = (0x61, 0x10) #=> $0000 ADC ($0010,X) mpu.memory[0x0013:0x0014] = (0xCD, 0xAB) #=> Vector to $ABCD mpu.memory[0xABCD] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x01, mpu.a) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) self.assertNotEquals(mpu.CARRY, mpu.flags & mpu.CARRY) def test_adc_bcd_off_indirect_indexed_carry_clear_in_no_carry_clear_out(self): mpu = MPU() mpu.a = 0x01 mpu.x = 0x03 mpu.memory[0x0000:0x0001] = (0x61, 0x10) #=> $0000 ADC ($0010,X) mpu.memory[0x0013:0x0014] = (0xCD, 0xAB) #=> Vector to $ABCD mpu.memory[0xABCD] = 0xFE mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0xFF, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.CARRY) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_adc_bcd_off_indirect_indexed_carry_clear_in_carry_set_out(self): mpu = MPU() mpu.a = 0x02 mpu.x = 0x03 mpu.memory[0x0000:0x0001] = (0x61, 0x10) #=> $0000 ADC ($0010,X) mpu.memory[0x0013:0x0014] = (0xCD, 0xAB) #=> Vector to $ABCD mpu.memory[0xABCD] = 0xFF mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x01, mpu.a) self.assertEquals(mpu.CARRY, mpu.flags & mpu.CARRY) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_adc_bcd_off_indirect_indexed_overflow(self): mpu = MPU() mpu.a = 0xFF mpu.x = 0x03 mpu.memory[0x0000:0x0001] = (0x61, 0x10) #=> $0000 ADC ($0010,X) mpu.memory[0x0013:0x0014] = (0xCD, 0xAB) #=> Vector to $ABCD mpu.memory[0xABCD] = 0xFF mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0xFE, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(mpu.OVERFLOW, mpu.flags & mpu.OVERFLOW) self.assertEquals(0, mpu.flags & mpu.ZERO) # ADC Indexed, Indirect (Y) def test_adc_bcd_off_indexed_indirect_carry_clear_in_accumulator_zeroes(self): mpu = MPU() mpu.a = 0x00 mpu.y = 0x03 mpu.memory[0x0000:0x0001] = (0x71, 0x10) #=> $0000 ADC ($0010),Y mpu.memory[0x0010:0x0011] = (0xCD, 0xAB) #=> Vector to $ABCD mpu.memory[0xABCD + mpu.y] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(0, mpu.flags & mpu.CARRY) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) def test_adc_bcd_off_indexed_indirect_carry_set_in_accumulator_zero(self): mpu = MPU() mpu.a = 0 mpu.y = 0x03 mpu.flags |= mpu.CARRY mpu.memory[0x0000:0x0001] = (0x71, 0x10) #=> $0000 ADC ($0010),Y mpu.memory[0x0010:0x0011] = (0xCD, 0xAB) #=> Vector to $ABCD mpu.memory[0xABCD + mpu.y] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x01, mpu.a) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) self.assertNotEquals(mpu.CARRY, mpu.flags & mpu.CARRY) def test_adc_bcd_off_indexed_indirect_carry_clear_in_no_carry_clear_out(self): mpu = MPU() mpu.a = 0x01 mpu.y = 0x03 mpu.memory[0x0000:0x0001] = (0x71, 0x10) #=> $0000 ADC ($0010),Y mpu.memory[0x0010:0x0011] = (0xCD, 0xAB) #=> Vector to $ABCD mpu.memory[0xABCD + mpu.y] = 0xFE mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0xFF, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.CARRY) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_adc_bcd_off_indexed_indirect_carry_clear_in_carry_set_out(self): mpu = MPU() mpu.a = 0x02 mpu.y = 0x03 mpu.memory[0x0000:0x0001] = (0x71, 0x10) #=> $0000 ADC ($0010),Y mpu.memory[0x0010:0x0011] = (0xCD, 0xAB) #=> Vector to $ABCD mpu.memory[0xABCD + mpu.y] = 0xFF mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x01, mpu.a) self.assertEquals(mpu.CARRY, mpu.flags & mpu.CARRY) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_adc_bcd_off_indexed_indirect_indexed_overflow(self): mpu = MPU() mpu.a = 0xFF mpu.x = 0x03 mpu.memory[0x0000:0x0001] = (0x61, 0x10) #=> $0000 ADC ($0010,X) mpu.memory[0x0013:0x0014] = (0xCD, 0xAB) #=> Vector to $ABCD mpu.memory[0xABCD] = 0xFF mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0xFE, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(mpu.OVERFLOW, mpu.flags & mpu.OVERFLOW) self.assertEquals(0, mpu.flags & mpu.ZERO) # AND (Absolute) def test_and_absolute_all_zeros_setting_zero_flag(self): mpu = MPU() mpu.a = 0xFF mpu.memory[0x0000:0x0002] = (0x2D, 0xCD, 0xAB) #=> AND $ABCD mpu.memory[0xABCD] = 0x00 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_and_absolute_zeros_and_ones_setting_negative_flag(self): mpu = MPU() mpu.a = 0xFF mpu.memory[0x0000:0x0002] = (0x2D, 0xCD, 0xAB) #=> AND $ABCD mpu.memory[0xABCD] = 0xAA mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0xAA, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) # AND (Absolute) def test_and_zp_all_zeros_setting_zero_flag(self): mpu = MPU() mpu.a = 0xFF mpu.memory[0x0000:0x0001] = (0x25, 0x10) #=> AND $0010 mpu.memory[0x0010] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_and_zp_zeros_and_ones_setting_negative_flag(self): mpu = MPU() mpu.a = 0xFF mpu.memory[0x0000:0x0001] = (0x25, 0x10) #=> AND $0010 mpu.memory[0x0010] = 0xAA mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0xAA, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) # AND (Immediate) def test_and_immediate_all_zeros_setting_zero_flag(self): mpu = MPU() mpu.a = 0xFF mpu.memory[0x0000:0x0001] = (0x29, 0x00) #=> AND #$00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_and_immediate_zeros_and_ones_setting_negative_flag(self): mpu = MPU() mpu.a = 0xFF mpu.memory[0x0000:0x0001] = (0x29, 0xAA) #=> AND #$AA mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0xAA, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) # AND (Absolute, X-Indexed) def test_and_abs_x_all_zeros_setting_zero_flag(self): mpu = MPU() mpu.a = 0xFF mpu.x = 0x03 mpu.memory[0x0000:0x0002] = (0x3d, 0xCD, 0xAB) #=> AND $ABCD,X mpu.memory[0xABCD + mpu.x] = 0x00 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_and_abs_x_zeros_and_ones_setting_negative_flag(self): mpu = MPU() mpu.a = 0xFF mpu.x = 0x03 mpu.memory[0x0000:0x0002] = (0x3d, 0xCD, 0xAB) #=> AND $ABCD,X mpu.memory[0xABCD + mpu.x] = 0xAA mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0xAA, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) # AND (Absolute, Y-Indexed) def test_and_abs_y_all_zeros_setting_zero_flag(self): mpu = MPU() mpu.a = 0xFF mpu.y = 0x03 mpu.memory[0x0000:0x0002] = (0x39, 0xCD, 0xAB) #=> AND $ABCD,X mpu.memory[0xABCD + mpu.y] = 0x00 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_and_abs_y_zeros_and_ones_setting_negative_flag(self): mpu = MPU() mpu.a = 0xFF mpu.y = 0x03 mpu.memory[0x0000:0x0002] = (0x39, 0xCD, 0xAB) #=> AND $ABCD,X mpu.memory[0xABCD + mpu.y] = 0xAA mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0xAA, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) # AND Indirect, Indexed (X) def test_and_indirect_indexed_x_all_zeros_setting_zero_flag(self): mpu = MPU() mpu.a = 0xFF mpu.x = 0x03 mpu.memory[0x0000:0x0001] = (0x21, 0x10) #=> AND ($0010,X) mpu.memory[0x0013:0x0014] = (0xCD, 0xAB) #=> Vector to $ABCD mpu.memory[0xABCD] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_and_indirect_indexed_x_zeros_and_ones_setting_negative_flag(self): mpu = MPU() mpu.a = 0xFF mpu.x = 0x03 mpu.memory[0x0000:0x0001] = (0x21, 0x10) #=> AND ($0010,X) mpu.memory[0x0013:0x0014] = (0xCD, 0xAB) #=> Vector to $ABCD mpu.memory[0xABCD] = 0xAA mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0xAA, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) # AND Indexed, Indirect (Y) def test_and_indexed_indirect_y_all_zeros_setting_zero_flag(self): mpu = MPU() mpu.a = 0xFF mpu.y = 0x03 mpu.memory[0x0000:0x0001] = (0x31, 0x10) #=> AND ($0010),Y mpu.memory[0x0010:0x0011] = (0xCD, 0xAB) #=> Vector to $ABCD mpu.memory[0xABCD + mpu.y] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_and_indexed_indirect_y_zeros_and_ones_setting_negative_flag(self): mpu = MPU() mpu.a = 0xFF mpu.y = 0x03 mpu.memory[0x0000:0x0001] = (0x31, 0x10) #=> AND ($0010),Y mpu.memory[0x0010:0x0011] = (0xCD, 0xAB) #=> Vector to $ABCD mpu.memory[0xABCD + mpu.y] = 0xAA mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0xAA, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) # AND Zero Page, X-Indexed def test_and_zp_x_all_zeros_setting_zero_flag(self): mpu = MPU() mpu.a = 0xFF mpu.x = 0x03 mpu.memory[0x0000:0x0001] = (0x35, 0x10) #=> AND $0010,X mpu.memory[0x0010 + mpu.x] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_and_zp_x_all_zeros_and_ones_setting_negative_flag(self): mpu = MPU() mpu.a = 0xFF mpu.x = 0x03 mpu.memory[0x0000:0x0001] = (0x35, 0x10) #=> AND $0010,X mpu.memory[0x0010 + mpu.x] = 0xAA mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0xAA, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) # ASL Accumulator def test_asl_accumulator_sets_z_flag(self): mpu = MPU() mpu.a = 0x00 mpu.memory[0x0000] = 0x0A #=> ASL A mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_asl_accumulator_sets_n_flag(self): mpu = MPU() mpu.a = 0x40 mpu.memory[0x0000] = 0x0A #=> ASL A mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0x80, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_asl_accumulator_shifts_out_zero(self): mpu = MPU() mpu.a = 0x7F mpu.memory[0x0000] = 0x0A #=> ASL A mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0xFE, mpu.a) self.assertEquals(0, mpu.flags & mpu.CARRY) def test_asl_accumulator_shifts_out_one(self): mpu = MPU() mpu.a = 0xFF mpu.memory[0x0000] = 0x0A #=> ASL A mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0xFE, mpu.a) self.assertEquals(mpu.CARRY, mpu.flags & mpu.CARRY) # ASL Absolute def test_asl_absolute_sets_z_flag(self): mpu = MPU() mpu.memory[0x0000:0x0002] = (0x0E, 0xCD, 0xAB) #=> ASL $ABCD mpu.memory[0xABCD] = 0x00 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x00, mpu.memory[0xABCD]) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_asl_absolute_sets_n_flag(self): mpu = MPU() mpu.memory[0x0000:0x0002] = (0x0E, 0xCD, 0xAB) #=> ASL $ABCD mpu.memory[0xABCD] = 0x40 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x80, mpu.memory[0xABCD]) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_asl_absolute_shifts_out_zero(self): mpu = MPU() mpu.a = 0xAA mpu.memory[0x0000:0x0002] = (0x0E, 0xCD, 0xAB) #=> ASL $ABCD mpu.memory[0xABCD] = 0x7F mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0xAA, mpu.a) self.assertEquals(0xFE, mpu.memory[0xABCD]) self.assertEquals(0, mpu.flags & mpu.CARRY) def test_asl_absolute_shifts_out_one(self): mpu = MPU() mpu.a = 0xAA mpu.memory[0x0000:0x0002] = (0x0E, 0xCD, 0xAB) #=> ASL $ABCD mpu.memory[0xABCD] = 0xFF mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0xAA, mpu.a) self.assertEquals(0xFE, mpu.memory[0xABCD]) self.assertEquals(mpu.CARRY, mpu.flags & mpu.CARRY) # ASL Zero Page def test_asl_zp_sets_z_flag(self): mpu = MPU() mpu.memory[0x0000:0x0001] = (0x06, 0x10) #=> ASL $0010 mpu.memory[0x0010] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.memory[0x0010]) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_asl_zp_sets_n_flag(self): mpu = MPU() mpu.memory[0x0000:0x0001] = (0x06, 0x10) #=> ASL $0010 mpu.memory[0x0010] = 0x40 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x80, mpu.memory[0x0010]) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_asl_zp_shifts_out_zero(self): mpu = MPU() mpu.a = 0xAA mpu.memory[0x0000:0x0001] = (0x06, 0x10) #=> ASL $0010 mpu.memory[0x0010] = 0x7F mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0xAA, mpu.a) self.assertEquals(0xFE, mpu.memory[0x0010]) self.assertEquals(0, mpu.flags & mpu.CARRY) def test_asl_zp_shifts_out_one(self): mpu = MPU() mpu.a = 0xAA mpu.memory[0x0000:0x0001] = (0x06, 0x10) #=> ASL $0010 mpu.memory[0x0010] = 0xFF mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0xAA, mpu.a) self.assertEquals(0xFE, mpu.memory[0x0010]) self.assertEquals(mpu.CARRY, mpu.flags & mpu.CARRY) # ASL Absolute, X-Indexed def test_asl_absolute_x_indexed_sets_z_flag(self): mpu = MPU() mpu.x = 0x03 mpu.memory[0x0000:0x0002] = (0x1E, 0xCD, 0xAB) #=> ASL $ABCD,X mpu.memory[0xABCD + mpu.x] = 0x00 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x00, mpu.memory[0xABCD + mpu.x]) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_asl_absolute_x_indexed_sets_n_flag(self): mpu = MPU() mpu.x = 0x03 mpu.memory[0x0000:0x0002] = (0x1E, 0xCD, 0xAB) #=> ASL $ABCD,X mpu.memory[0xABCD + mpu.x] = 0x40 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x80, mpu.memory[0xABCD + mpu.x]) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_asl_absolute_x_indexed_shifts_out_zero(self): mpu = MPU() mpu.a = 0xAA mpu.x = 0x03 mpu.memory[0x0000:0x0002] = (0x1E, 0xCD, 0xAB) #=> ASL $ABCD,X mpu.memory[0xABCD + mpu.x] = 0x7F mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0xAA, mpu.a) self.assertEquals(0xFE, mpu.memory[0xABCD + mpu.x]) self.assertEquals(0, mpu.flags & mpu.CARRY) def test_asl_absolute_x_indexed_shifts_out_one(self): mpu = MPU() mpu.a = 0xAA mpu.x = 0x03 mpu.memory[0x0000:0x0002] = (0x1E, 0xCD, 0xAB) #=> ASL $ABCD,X mpu.memory[0xABCD + mpu.x] = 0xFF mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0xAA, mpu.a) self.assertEquals(0xFE, mpu.memory[0xABCD + mpu.x]) self.assertEquals(mpu.CARRY, mpu.flags & mpu.CARRY) # ASL Zero Page, X-Indexed def test_asl_zp_x_indexed_sets_z_flag(self): mpu = MPU() mpu.x = 0x03 mpu.memory[0x0000:0x0001] = (0x16, 0x10) #=> ASL $0010,X mpu.memory[0x0010 + mpu.x] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.memory[0x0010 + mpu.x]) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_asl_zp_x_indexed_sets_n_flag(self): mpu = MPU() mpu.x = 0x03 mpu.memory[0x0000:0x0001] = (0x16, 0x10) #=> ASL $0010,X mpu.memory[0x0010 + mpu.x] = 0x40 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x80, mpu.memory[0x0010 + mpu.x]) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_asl_zp_x_indexed_shifts_out_zero(self): mpu = MPU() mpu.x = 0x03 mpu.a = 0xAA mpu.memory[0x0000:0x0001] = (0x16, 0x10) #=> ASL $0010,X mpu.memory[0x0010 + mpu.x] = 0x7F mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0xAA, mpu.a) self.assertEquals(0xFE, mpu.memory[0x0010 + mpu.x]) self.assertEquals(0, mpu.flags & mpu.CARRY) def test_asl_zp_x_indexed_shifts_out_one(self): mpu = MPU() mpu.x = 0x03 mpu.a = 0xAA mpu.memory[0x0000:0x0001] = (0x16, 0x10) #=> ASL $0010,X mpu.memory[0x0010 + mpu.x] = 0xFF mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0xAA, mpu.a) self.assertEquals(0xFE, mpu.memory[0x0010 + mpu.x]) self.assertEquals(mpu.CARRY, mpu.flags & mpu.CARRY) # BCC def test_bcc_carry_clear_branches_relative_forward(self): mpu = MPU() mpu.flags &= ~(mpu.CARRY) mpu.memory[0x0000:0x0001] = (0x90, 0x06) #=> BCC +6 mpu.step() self.assertEquals(0x0002 + 0x06, mpu.pc) def test_bcc_carry_clear_branches_relative_backward(self): mpu = MPU() mpu.flags &= ~(mpu.CARRY) mpu.pc = 0x0050 rel = (0x06^0xFF + 1) # two's complement of 6 mpu.memory[0x0050:0x0051] = (0x90, rel) #=> BCC -6 mpu.step() self.assertEquals(0x0052 + rel, mpu.pc) def test_bcc_carry_set_does_not_branch(self): mpu = MPU() mpu.flags |= mpu.CARRY mpu.memory[0x0000:0x0001] = (0x90, 0x06) #=> BCC +6 mpu.step() self.assertEquals(0x0002, mpu.pc) # BCS def test_bcs_carry_set_branches_relative_forward(self): mpu = MPU() mpu.flags |= mpu.CARRY mpu.memory[0x0000:0x0001] = (0xB0, 0x06) #=> BCS +6 mpu.step() self.assertEquals(0x0002 + 0x06, mpu.pc) def test_bcs_carry_set_branches_relative_backward(self): mpu = MPU() mpu.flags |= mpu.CARRY mpu.pc = 0x0050 rel = (0x06^0xFF + 1) # two's complement of 6 mpu.memory[0x0050:0x0051] = (0xB0, rel) #=> BCS -6 mpu.step() self.assertEquals(0x0052 + rel, mpu.pc) def test_bcs_carry_clear_does_not_branch(self): mpu = MPU() mpu.flags &= ~(mpu.CARRY) mpu.memory[0x0000:0x0001] = (0xB0, 0x06) #=> BCS +6 mpu.step() self.assertEquals(0x0002, mpu.pc) # BEQ def test_beq_zero_set_branches_relative_forward(self): mpu = MPU() mpu.flags |= mpu.ZERO mpu.memory[0x0000:0x0001] = (0xF0, 0x06) #=> BEQ +6 mpu.step() self.assertEquals(0x0002 + 0x06, mpu.pc) def test_beq_zero_set_branches_relative_backward(self): mpu = MPU() mpu.flags |= mpu.ZERO mpu.pc = 0x0050 rel = (0x06^0xFF + 1) # two's complement of 6 mpu.memory[0x0050:0x0051] = (0xF0, rel) #=> BEQ -6 mpu.step() self.assertEquals(0x0052 + rel, mpu.pc) def test_beq_zero_clear_does_not_branch(self): mpu = MPU() mpu.flags &= ~(mpu.ZERO) mpu.memory[0x0000:0x0001] = (0xF0, 0x06) #=> BEQ +6 mpu.step() self.assertEquals(0x0002, mpu.pc) # BMI def test_bmi_negative_set_branches_relative_forward(self): mpu = MPU() mpu.flags |= mpu.NEGATIVE mpu.memory[0x0000:0x0001] = (0x30, 0x06) #=> BMI +06 mpu.step() self.assertEquals(0x0002 + 0x06, mpu.pc) def test_bmi_negative_set_branches_relative_backward(self): mpu = MPU() mpu.flags |= mpu.NEGATIVE mpu.pc = 0x0050 rel = (0x06^0xFF + 1) # two's complement of 6 mpu.memory[0x0050:0x0051] = (0x30, rel) #=> BMI -6 mpu.step() self.assertEquals(0x0052 + rel, mpu.pc) def test_bmi_negative_clear_does_not_branch(self): mpu = MPU() mpu.flags &= ~(mpu.NEGATIVE) mpu.memory[0x0000:0x0001] = (0x30, 0x06) #=> BEQ +6 mpu.step() self.assertEquals(0x0002, mpu.pc) # BNE def test_bne_zero_clear_branches_relative_forward(self): mpu = MPU() mpu.flags &= ~(mpu.ZERO) mpu.memory[0x0000:0x0001] = (0xD0, 0x06) #=> BNE +6 mpu.step() self.assertEquals(0x0002 + 0x06, mpu.pc) def test_bne_zero_clear_branches_relative_backward(self): mpu = MPU() mpu.flags &= ~(mpu.ZERO) mpu.pc = 0x0050 rel = (0x06^0xFF + 1) # two's complement of 6 mpu.memory[0x0050:0x0051] = (0xD0, rel) #=> BNE -6 mpu.step() self.assertEquals(0x0052 + rel, mpu.pc) def test_bne_zero_set_does_not_branch(self): mpu = MPU() mpu.flags |= mpu.ZERO mpu.memory[0x0000:0x0001] = (0xD0, 0x06) #=> BNE +6 mpu.step() self.assertEquals(0x0002, mpu.pc) # BPL def test_bpl_negative_clear_branches_relative_forward(self): mpu = MPU() mpu.flags &= ~(mpu.NEGATIVE) mpu.memory[0x0000:0x0001] = (0x10, 0x06) #=> BPL +06 mpu.step() self.assertEquals(0x0002 + 0x06, mpu.pc) def test_bpl_negative_clear_branches_relative_backward(self): mpu = MPU() mpu.flags &= ~(mpu.NEGATIVE) mpu.pc = 0x0050 rel = (0x06^0xFF + 1) # two's complement of 6 mpu.memory[0x0050:0x0051] = (0x10, rel) #=> BPL -6 mpu.step() self.assertEquals(0x0052 + rel, mpu.pc) def test_bpl_negative_set_does_not_branch(self): mpu = MPU() mpu.flags |= mpu.NEGATIVE mpu.memory[0x0000:0x0001] = (0x10, 0x06) #=> BPL +6 mpu.step() self.assertEquals(0x0002, mpu.pc) # BRK def test_brk_pushes_pc_plus_2_and_status_then_sets_pc_to_irq_vector(self): mpu = MPU() mpu.flags = 0x00 mpu.memory[0xFFFE:0xFFFF] = (0xCD, 0xAB) mpu.memory[0xC000] = 0x00 #=> BRK mpu.pc = 0xC000 mpu.step() self.assertEquals(0xABCD, mpu.pc) self.assertEquals(0xC0, mpu.memory[0x1FF]) # PCH self.assertEquals(0x03, mpu.memory[0x1FE]) # PCL self.assertEquals(mpu.BREAK, mpu.memory[0x1FD]) # Status (P) self.assertEquals(0xFC, mpu.sp) self.assertEquals(mpu.BREAK | mpu.INTERRUPT, mpu.flags) # BVC def test_bvc_overflow_clear_branches_relative_forward(self): mpu = MPU() mpu.flags &= ~(mpu.OVERFLOW) mpu.memory[0x0000:0x0001] = (0x50, 0x06) #=> BVC +6 mpu.step() self.assertEquals(0x0002 + 0x06, mpu.pc) def test_bvc_overflow_clear_branches_relative_backward(self): mpu = MPU() mpu.flags &= ~(mpu.OVERFLOW) mpu.pc = 0x0050 rel = (0x06^0xFF + 1) # two's complement of 6 mpu.memory[0x0050:0x0051] = (0x50, rel) #=> BVC -6 mpu.step() self.assertEquals(0x0052 + rel, mpu.pc) def test_bvc_overflow_set_does_not_branch(self): mpu = MPU() mpu.flags |= mpu.OVERFLOW mpu.memory[0x0000:0x0001] = (0x50, 0x06) #=> BVC +6 mpu.step() self.assertEquals(0x0002, mpu.pc) # BVS def test_bvs_overflow_set_branches_relative_forward(self): mpu = MPU() mpu.flags |= mpu.OVERFLOW mpu.memory[0x0000:0x0001] = (0x70, 0x06) #=> BVS +6 mpu.step() self.assertEquals(0x0002 + 0x06, mpu.pc) def test_bvs_overflow_set_branches_relative_backward(self): mpu = MPU() mpu.flags |= mpu.OVERFLOW mpu.pc = 0x0050 rel = (0x06^0xFF + 1) # two's complement of 6 mpu.memory[0x0050:0x0051] = (0x70, rel) #=> BVS -6 mpu.step() self.assertEquals(0x0052 + rel, mpu.pc) def test_bvs_overflow_clear_does_not_branch(self): mpu = MPU() mpu.flags &= ~(mpu.OVERFLOW) mpu.memory[0x0000:0x0001] = (0x70, 0x06) #=> BVS +6 mpu.step() self.assertEquals(0x0002, mpu.pc) # CLC def test_clc_clears_carry_flag(self): mpu = MPU() mpu.flags |= mpu.CARRY mpu.memory[0x0000] = 0x18 #=> CLC mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0, mpu.flags & mpu.CARRY) # CLD def test_cld_clears_decimal_flag(self): mpu = MPU() mpu.flags |= mpu.DECIMAL mpu.memory[0x0000] = 0xD8 #=> CLD mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0, mpu.flags & mpu.DECIMAL) # CLI def test_cli_clears_interrupt_mask_flag(self): mpu = MPU() mpu.flags |= mpu.INTERRUPT mpu.memory[0x0000] = 0x58 #=> CLI mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0, mpu.flags & mpu.INTERRUPT) # CLV def test_clv_clears_overflow_flag(self): mpu = MPU() mpu.flags |= mpu.OVERFLOW mpu.memory[0x0000] = 0xB8 #=> CLV mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0, mpu.flags & mpu.OVERFLOW) # DEC Absolute def test_dec_abs_decrements_memory(self): mpu = MPU() mpu.memory[0x0000:0x0002] = (0xCE, 0xCD, 0xAB) #=> DEC 0xABCD mpu.memory[0xABCD] = 0x10 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x0F, mpu.memory[0xABCD]) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_dec_abs_below_00_rolls_over_and_sets_negative_flag(self): mpu = MPU() mpu.memory[0x0000:0x0002] = (0xCE, 0xCD, 0xAB) #=> DEC 0xABCD mpu.memory[0xABCD] = 0x00 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0xFF, mpu.memory[0xABCD]) self.assertEquals(0, mpu.flags & mpu.ZERO) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) def test_dec_abs_sets_zero_flag_when_decrementing_to_zero(self): mpu = MPU() mpu.memory[0x0000:0x0002] = (0xCE, 0xCD, 0xAB) #=> DEC 0xABCD mpu.memory[0xABCD] = 0x01 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x00, mpu.memory[0xABCD]) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) # DEC Zero Page def test_dec_zp_decrements_memory(self): mpu = MPU() mpu.memory[0x0000:0x0001] = (0xC6, 0x10) #=> DEC 0x0010 mpu.memory[0x0010] = 0x10 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x0F, mpu.memory[0x0010]) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_dec_zp_below_00_rolls_over_and_sets_negative_flag(self): mpu = MPU() mpu.memory[0x0000:0x0001] = (0xC6, 0x10) #=> DEC 0x0010 mpu.memory[0x0010] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0xFF, mpu.memory[0x0010]) self.assertEquals(0, mpu.flags & mpu.ZERO) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) def test_dec_zp_sets_zero_flag_when_decrementing_to_zero(self): mpu = MPU() mpu.memory[0x0000:0x0001] = (0xC6, 0x10) #=> DEC 0x0010 mpu.memory[0x0010] = 0x01 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.memory[0x0010]) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) # DEC Absolute, X-Indexed def test_dec_abs_x_decrements_memory(self): mpu = MPU() mpu.memory[0x0000:0x0002] = (0xDE, 0xCD, 0xAB) #=> DEC 0xABCD,X mpu.x = 0x03 mpu.memory[0xABCD + mpu.x] = 0x10 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x0F, mpu.memory[0xABCD + mpu.x]) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_dec_abs_x_below_00_rolls_over_and_sets_negative_flag(self): mpu = MPU() mpu.memory[0x0000:0x0002] = (0xDE, 0xCD, 0xAB) #=> DEC 0xABCD,X mpu.memory[0xABCD + mpu.x] = 0x00 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0xFF, mpu.memory[0xABCD + mpu.x]) self.assertEquals(0, mpu.flags & mpu.ZERO) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) def test_dec_abs_x_sets_zero_flag_when_decrementing_to_zero(self): mpu = MPU() mpu.memory[0x0000:0x0002] = (0xDE, 0xCD, 0xAB) #=> DEC 0xABCD,X mpu.memory[0xABCD + mpu.x] = 0x01 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x00, mpu.memory[0xABCD + mpu.x]) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) # DEC Zero Page, X-Indexed def test_dec_zp_x_decrements_memory(self): mpu = MPU() mpu.memory[0x0000:0x0001] = (0xD6, 0x10) #=> DEC 0x0010,X mpu.x = 0x03 mpu.memory[0x0010 + mpu.x] = 0x10 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x0F, mpu.memory[0x0010 + mpu.x]) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_dec_zp_x_below_00_rolls_over_and_sets_negative_flag(self): mpu = MPU() mpu.memory[0x0000:0x0001] = (0xD6, 0x10) #=> DEC 0x0010,X mpu.x = 0x03 mpu.memory[0x0010 + mpu.x] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0xFF, mpu.memory[0x0010 + mpu.x]) self.assertEquals(0, mpu.flags & mpu.ZERO) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) def test_dec_zp_x_sets_zero_flag_when_decrementing_to_zero(self): mpu = MPU() mpu.memory[0x0000:0x0001] = (0xD6, 0x10) #=> DEC 0x0010,X mpu.x = 0x03 mpu.memory[0x0010 + mpu.x] = 0x01 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.memory[0x0010 + mpu.x]) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) # DEX def test_dex_decrements_x(self): mpu = MPU() mpu.x = 0x10 mpu.memory[0x0000] = 0xCA #=> DEX mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0x0F, mpu.x) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_dex_below_00_rolls_over_and_sets_negative_flag(self): mpu = MPU() mpu.x = 0x00 mpu.memory[0x0000] = 0xCA #=> DEX mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0xFF, mpu.x) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_dex_sets_zero_flag_when_decrementing_to_zero(self): mpu = MPU() mpu.x = 0x01 mpu.memory[0x0000] = 0xCA #=> DEX mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0x00, mpu.x) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) # DEY def test_dey_decrements_y(self): mpu = MPU() mpu.y = 0x10 mpu.memory[0x0000] = 0x88 #=> DEY mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0x0F, mpu.y) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_dey_below_00_rolls_over_and_sets_negative_flag(self): mpu = MPU() mpu.y = 0x00 mpu.memory[0x0000] = 0x88 #=> DEY mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0xFF, mpu.y) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) def test_dey_sets_zero_flag_when_decrementing_to_zero(self): mpu = MPU() mpu.y = 0x01 mpu.memory[0x0000] = 0x88 #=> DEY mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0x00, mpu.y) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) # EOR Absolute def test_eor_absolute_flips_bits_over_setting_z_flag(self): mpu = MPU() mpu.a = 0xFF mpu.memory[0x0000:0x0002] = (0x4D, 0xCD, 0xAB) mpu.memory[0xABCD] = 0xFF mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(0xFF, mpu.memory[0xABCD]) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) def test_eor_absolute_flips_bits_over_setting_n_flag(self): mpu = MPU() mpu.a = 0x00 mpu.memory[0x0000:0x0002] = (0x4D, 0xCD, 0xAB) mpu.memory[0xABCD] = 0xFF mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0xFF, mpu.a) self.assertEquals(0xFF, mpu.memory[0xABCD]) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) # EOR Zero Page def test_eor_zp_flips_bits_over_setting_z_flag(self): mpu = MPU() mpu.a = 0xFF mpu.memory[0x0000:0x0001] = (0x45, 0x10) mpu.memory[0x0010] = 0xFF mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(0xFF, mpu.memory[0x0010]) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) def test_eor_zp_flips_bits_over_setting_n_flag(self): mpu = MPU() mpu.a = 0x00 mpu.memory[0x0000:0x0002] = (0x45, 0x10) mpu.memory[0x0010] = 0xFF mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0xFF, mpu.a) self.assertEquals(0xFF, mpu.memory[0x0010]) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) # EOR Immediate def test_eor_immediate_flips_bits_over_setting_z_flag(self): mpu = MPU() mpu.a = 0xFF mpu.memory[0x0000:0x0001] = (0x49, 0xFF) mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) def test_eor_immediate_flips_bits_over_setting_n_flag(self): mpu = MPU() mpu.a = 0x00 mpu.memory[0x0000:0x0002] = (0x49, 0xFF) mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0xFF, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) # EOR Absolute, X-Indexed def test_eor_absolute_x_indexed_flips_bits_over_setting_z_flag(self): mpu = MPU() mpu.a = 0xFF mpu.x = 0x03 mpu.memory[0x0000:0x0002] = (0x5D, 0xCD, 0xAB) mpu.memory[0xABCD + mpu.x] = 0xFF mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(0xFF, mpu.memory[0xABCD + mpu.x]) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) def test_eor_absolute_x_indexed_flips_bits_over_setting_n_flag(self): mpu = MPU() mpu.a = 0x00 mpu.x = 0x03 mpu.memory[0x0000:0x0002] = (0x5D, 0xCD, 0xAB) mpu.memory[0xABCD + mpu.x] = 0xFF mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0xFF, mpu.a) self.assertEquals(0xFF, mpu.memory[0xABCD + mpu.x]) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) # EOR Absolute, Y-Indexed def test_eor_absolute_y_indexed_flips_bits_over_setting_z_flag(self): mpu = MPU() mpu.a = 0xFF mpu.y = 0x03 mpu.memory[0x0000:0x0002] = (0x59, 0xCD, 0xAB) mpu.memory[0xABCD + mpu.y] = 0xFF mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(0xFF, mpu.memory[0xABCD + mpu.y]) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) def test_eor_absolute_y_indexed_flips_bits_over_setting_n_flag(self): mpu = MPU() mpu.a = 0x00 mpu.y = 0x03 mpu.memory[0x0000:0x0002] = (0x59, 0xCD, 0xAB) mpu.memory[0xABCD + mpu.y] = 0xFF mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0xFF, mpu.a) self.assertEquals(0xFF, mpu.memory[0xABCD + mpu.y]) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) # EOR Indirect, Indexed (X) def test_eor_indirect_indexed_x_flips_bits_over_setting_z_flag(self): mpu = MPU() mpu.a = 0xFF mpu.x = 0x03 mpu.memory[0x0000:0x0001] = (0x41, 0x10) #=> EOR ($0010,X) mpu.memory[0x0013:0x0014] = (0xCD, 0xAB) #=> Vector to $ABCD mpu.memory[0xABCD] = 0xFF mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(0xFF, mpu.memory[0xABCD]) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) def test_eor_indirect_indexed_x_flips_bits_over_setting_n_flag(self): mpu = MPU() mpu.a = 0x00 mpu.x = 0x03 mpu.memory[0x0000:0x0001] = (0x41, 0x10) #=> EOR ($0010,X) mpu.memory[0x0013:0x0014] = (0xCD, 0xAB) #=> Vector to $ABCD mpu.memory[0xABCD] = 0xFF mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0xFF, mpu.a) self.assertEquals(0xFF, mpu.memory[0xABCD]) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) # EOR Indexed, Indirect (Y) def test_eor_indexed_indirect_y_flips_bits_over_setting_z_flag(self): mpu = MPU() mpu.a = 0xFF mpu.y = 0x03 mpu.memory[0x0000:0x0001] = (0x51, 0x10) #=> EOR ($0010),Y mpu.memory[0x0010:0x0011] = (0xCD, 0xAB) #=> Vector to $ABCD mpu.memory[0xABCD + mpu.y] = 0xFF mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(0xFF, mpu.memory[0xABCD + mpu.y]) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) def test_eor_indexed_indirect_y_flips_bits_over_setting_n_flag(self): mpu = MPU() mpu.a = 0x00 mpu.y = 0x03 mpu.memory[0x0000:0x0001] = (0x51, 0x10) #=> EOR ($0010),Y mpu.memory[0x0010:0x0011] = (0xCD, 0xAB) #=> Vector to $ABCD mpu.memory[0xABCD + mpu.y] = 0xFF mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0xFF, mpu.a) self.assertEquals(0xFF, mpu.memory[0xABCD + mpu.y]) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) # EOR Zero Page, X-Indexed def test_eor_zp_x_indexed_flips_bits_over_setting_z_flag(self): mpu = MPU() mpu.a = 0xFF mpu.x = 0x03 mpu.memory[0x0000:0x0001] = (0x55, 0x10) mpu.memory[0x0010 + mpu.x] = 0xFF mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(0xFF, mpu.memory[0x0010 + mpu.x]) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) def test_eor_zp_x_indexed_flips_bits_over_setting_n_flag(self): mpu = MPU() mpu.a = 0x00 mpu.x = 0x03 mpu.memory[0x0000:0x0002] = (0x55, 0x10) mpu.memory[0x0010 + mpu.x] = 0xFF mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0xFF, mpu.a) self.assertEquals(0xFF, mpu.memory[0x0010 + mpu.x]) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) # INC Absolute def test_inc_abs_increments_memory(self): mpu = MPU() mpu.memory[0x0000:0x0002] = (0xEE, 0xCD, 0xAB) mpu.memory[0xABCD] = 0x09 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x0A, mpu.memory[0xABCD]) self.assertEquals(0, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_inc_abs_increments_memory_rolls_over_and_sets_zero_flag(self): mpu = MPU() mpu.memory[0x0000:0x0002] = (0xEE, 0xCD, 0xAB) mpu.memory[0xABCD] = 0xFF mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x00, mpu.memory[0xABCD]) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_inc_abs_sets_negative_flag_when_incrementing_above_7F(self): mpu = MPU() mpu.memory[0x0000:0x0002] = (0xEE, 0xCD, 0xAB) mpu.memory[0xABCD] = 0x7F mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x80, mpu.memory[0xABCD]) self.assertEquals(0, mpu.flags & mpu.ZERO) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) # INC Zero Page def test_inc_zp_increments_memory(self): mpu = MPU() mpu.memory[0x0000:0x0001] = (0xE6, 0x10) mpu.memory[0x0010] = 0x09 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x0A, mpu.memory[0x0010]) self.assertEquals(0, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_inc_zp_increments_memory_rolls_over_and_sets_zero_flag(self): mpu = MPU() mpu.memory[0x0000:0x0001] = (0xE6, 0x10) mpu.memory[0x0010] = 0xFF mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.memory[0x0010]) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_inc_zp_sets_negative_flag_when_incrementing_above_7F(self): mpu = MPU() mpu.memory[0x0000:0x0001] = (0xE6, 0x10) mpu.memory[0x0010] = 0x7F mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x80, mpu.memory[0x0010]) self.assertEquals(0, mpu.flags & mpu.ZERO) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) # INC Absolute, X-Indexed def test_inc_abs_x_increments_memory(self): mpu = MPU() mpu.memory[0x0000:0x0002] = (0xFE, 0xCD, 0xAB) mpu.x = 0x03 mpu.memory[0xABCD + mpu.x] = 0x09 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x0A, mpu.memory[0xABCD + mpu.x]) self.assertEquals(0, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_inc_abs_x_increments_memory_rolls_over_and_sets_zero_flag(self): mpu = MPU() mpu.memory[0x0000:0x0002] = (0xFE, 0xCD, 0xAB) mpu.x = 0x03 mpu.memory[0xABCD + mpu.x] = 0xFF mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x00, mpu.memory[0xABCD + mpu.x]) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_inc_abs_x_sets_negative_flag_when_incrementing_above_7F(self): mpu = MPU() mpu.memory[0x0000:0x0002] = (0xFE, 0xCD, 0xAB) mpu.x = 0x03 mpu.memory[0xABCD + mpu.x] = 0x7F mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x80, mpu.memory[0xABCD + mpu.x]) self.assertEquals(0, mpu.flags & mpu.ZERO) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) # INC Zero Page, X-Indexed def test_inc_zp_x_increments_memory(self): mpu = MPU() mpu.memory[0x0000:0x0001] = (0xF6, 0x10) mpu.x = 0x03 mpu.memory[0x0010 + mpu.x] = 0x09 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x0A, mpu.memory[0x0010 + mpu.x]) self.assertEquals(0, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_inc_zp_x_increments_memory_rolls_over_and_sets_zero_flag(self): mpu = MPU() mpu.memory[0x0000:0x0001] = (0xF6, 0x10) mpu.memory[0x0010 + mpu.x] = 0xFF mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.memory[0x0010 + mpu.x]) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_inc_zp_x_sets_negative_flag_when_incrementing_above_7F(self): mpu = MPU() mpu.memory[0x0000:0x0001] = (0xF6, 0x10) mpu.memory[0x0010 + mpu.x] = 0x7F mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x80, mpu.memory[0x0010 + mpu.x]) self.assertEquals(0, mpu.flags & mpu.ZERO) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) # INX def test_inx_increments_x(self): mpu = MPU() mpu.x = 0x09 mpu.memory[0x0000] = 0xE8 #=> INX mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0x0A, mpu.x) self.assertEquals(0, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_inx_above_FF_rolls_over_and_sets_zero_flag(self): mpu = MPU() mpu.x = 0xFF mpu.memory[0x0000] = 0xE8 #=> INX mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0x00, mpu.x) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) def test_inx_sets_negative_flag_when_incrementing_above_7F(self): mpu = MPU() mpu.x = 0x7f mpu.memory[0x0000] = 0xE8 #=> INX mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0x80, mpu.x) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) # INY def test_iny_increments_y(self): mpu = MPU() mpu.y = 0x09 mpu.memory[0x0000] = 0xC8 #=> INY mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0x0A, mpu.y) self.assertEquals(0, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_iny_above_FF_rolls_over_and_sets_zero_flag(self): mpu = MPU() mpu.y = 0xFF mpu.memory[0x0000] = 0xC8 #=> INY mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0x00, mpu.y) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) def test_iny_sets_negative_flag_when_incrementing_above_7F(self): mpu = MPU() mpu.y = 0x7f mpu.memory[0x0000] = 0xC8 #=> INY mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0x80, mpu.y) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) # JMP def test_jmp_jumps_to_absolute_address(self): mpu = MPU() mpu.memory[0x0000:0x0002] = (0x4C, 0xCD, 0xAB) #=> JMP $ABCD mpu.step() self.assertEquals(0xABCD, mpu.pc) def test_jmp_jumps_to_indirect_address(self): mpu = MPU() mpu.memory[0x0000:0x0002] = (0x6C, 0x00, 0x02) #=> JMP ($ABCD) mpu.memory[0x0200:0x0201] = (0xCD, 0xAB) mpu.step() self.assertEquals(0xABCD, mpu.pc) # JSR def test_jsr_pushes_pc_plus_2_and_sets_pc(self): mpu = MPU() mpu.memory[0xC000:0xC002] = (0x20, 0xD2, 0xFF) #=> JSR $FFD2 mpu.pc = 0xC000 mpu.step() self.assertEquals(0xFFD2, mpu.pc) self.assertEquals(0xFD, mpu.sp) self.assertEquals(0xC0, mpu.memory[0x01FF]) # PCH self.assertEquals(0x02, mpu.memory[0x01FE]) # PCL+2 # LDA Absolute def test_lda_absolute_loads_a_sets_n_flag(self): mpu = MPU() mpu.a = 0x00 mpu.memory[0x0000:0x0002] = (0xAD, 0xCD, 0xAB) #=> LDA $ABCD mpu.memory[0xABCD] = 0x80 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x80, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_lda_absolute_loads_a_sets_z_flag(self): mpu = MPU() mpu.a = 0xFF mpu.memory[0x0000:0x0002] = (0xAD, 0xCD, 0xAB) #=> LDA $ABCD mpu.memory[0xABCD] = 0x00 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) # LDA Absolute def test_lda_absolute_loads_a_sets_n_flag(self): mpu = MPU() mpu.a = 0x00 mpu.memory[0x0000:0x0002] = (0xAD, 0xCD, 0xAB) #=> LDA $ABCD mpu.memory[0xABCD] = 0x80 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x80, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_lda_absolute_loads_a_sets_z_flag(self): mpu = MPU() mpu.a = 0xFF mpu.memory[0x0000:0x0002] = (0xAD, 0xCD, 0xAB) #=> LDA $ABCD mpu.memory[0xABCD] = 0x00 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) # LDA Zero Page def test_lda_zp_loads_a_sets_n_flag(self): mpu = MPU() mpu.a = 0x00 mpu.memory[0x0000:0x0002] = (0xA5, 0x10) #=> LDA $0010 mpu.memory[0x0010] = 0x80 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x80, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_lda_zp_loads_a_sets_z_flag(self): mpu = MPU() mpu.a = 0xFF mpu.memory[0x0000:0x0002] = (0xA5, 0x10) #=> LDA $0010 mpu.memory[0x0010] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) # LDA Immediate def test_lda_immediate_loads_a_sets_n_flag(self): mpu = MPU() mpu.a = 0x00 mpu.memory[0x0000:0x0002] = (0xA9, 0x80) #=> LDA #$80 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x80, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_ldx_immediate_loads_x_sets_z_flag(self): mpu = MPU() mpu.a = 0xFF mpu.memory[0x0000:0x0002] = (0xA2, 0x00) #=> LDA #$00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) # LDA Absolute, X-Indexed def test_lda_absolute_x_indexed_loads_a_sets_n_flag(self): mpu = MPU() mpu.a = 0x00 mpu.x = 0x03 mpu.memory[0x0000:0x0002] = (0xBD, 0xCD, 0xAB) #=> LDA $ABCD,X mpu.memory[0xABCD + mpu.x] = 0x80 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x80, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_lda_absolute_x_indexed_loads_x_sets_z_flag(self): mpu = MPU() mpu.a = 0xFF mpu.x = 0x03 mpu.memory[0x0000:0x0002] = (0xBD, 0xCD, 0xAB) #=> LDA $ABCD,X mpu.memory[0xABCD + mpu.y] = 0x00 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) # LDA Absolute, Y-Indexed def test_lda_absolute_y_indexed_loads_a_sets_n_flag(self): mpu = MPU() mpu.a = 0x00 mpu.y = 0x03 mpu.memory[0x0000:0x0002] = (0xB9, 0xCD, 0xAB) #=> LDA $ABCD,Y mpu.memory[0xABCD + mpu.y] = 0x80 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x80, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_lda_absolute_y_indexed_loads_a_sets_z_flag(self): mpu = MPU() mpu.a = 0xFF mpu.y = 0x03 mpu.memory[0x0000:0x0002] = (0xB9, 0xCD, 0xAB) #=> LDA $ABCD,Y mpu.memory[0xABCD + mpu.y] = 0x00 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) # LDA Indirect, Indexed (X) def test_lda_indirect_indexed_x_loads_a_sets_n_flag(self): mpu = MPU() mpu.a = 0x00 mpu.x = 0x03 mpu.memory[0x0000:0x0002] = (0xA1, 0x10) #=> LDA ($0010,X) mpu.memory[0x0013:0x0014] = (0xCD, 0xAB) #=> Vector to $ABCD mpu.memory[0xABCD] = 0x80 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x80, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_lda_indirect_indexed_x_loads_a_sets_z_flag(self): mpu = MPU() mpu.a = 0x00 mpu.x = 0x03 mpu.memory[0x0000:0x0002] = (0xA1, 0x10) #=> LDA ($0010,X) mpu.memory[0x0013:0x0014] = (0xCD, 0xAB) #=> Vector to $ABCD mpu.memory[0xABCD] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) # LDA Indexed, Indirect (Y) def test_lda_indexed_indirect_y_loads_a_sets_n_flag(self): mpu = MPU() mpu.a = 0x00 mpu.y = 0x03 mpu.memory[0x0000:0x0002] = (0xB1, 0x10) #=> LDA ($0010),Y mpu.memory[0x0010:0x0011] = (0xCD, 0xAB) #=> Vector to $ABCD mpu.memory[0xABCD + mpu.y] = 0x80 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x80, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_lda_indexed_indirect_y_loads_a_sets_z_flag(self): mpu = MPU() mpu.a = 0x00 mpu.y = 0x03 mpu.memory[0x0000:0x0002] = (0xB1, 0x10) #=> LDA ($0010),Y mpu.memory[0x0010:0x0011] = (0xCD, 0xAB) #=> Vector to $ABCD mpu.memory[0xABCD + mpu.y] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) # LDA Zero Page, X-Indexed def test_lda_zp_x_indexed_loads_x_sets_n_flag(self): mpu = MPU() mpu.a = 0x00 mpu.x = 0x03 mpu.memory[0x0000:0x0001] = (0xB5, 0x10) #=> LDA $0010,X mpu.memory[0x0010 + mpu.x] = 0x80 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x80, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_lda_zp_x_indexed_loads_x_sets_z_flag(self): mpu = MPU() mpu.a = 0xFF mpu.x = 0x03 mpu.memory[0x0000:0x0002] = (0xB5, 0x10) #=> LDA $0010,X mpu.memory[0x0010 + mpu.x] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) # LDX Absolute def test_ldx_absolute_loads_x_sets_n_flag(self): mpu = MPU() mpu.x = 0x00 mpu.memory[0x0000:0x0002] = (0xAE, 0xCD, 0xAB) #=> LDX $ABCD mpu.memory[0xABCD] = 0x80 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x80, mpu.x) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_ldx_absolute_loads_x_sets_z_flag(self): mpu = MPU() mpu.x = 0xFF mpu.memory[0x0000:0x0002] = (0xAE, 0xCD, 0xAB) #=> LDX $ABCD mpu.memory[0xABCD] = 0x00 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x00, mpu.x) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) # LDX Zero Page def test_ldx_zp_loads_x_sets_n_flag(self): mpu = MPU() mpu.x = 0x00 mpu.memory[0x0000:0x0002] = (0xA6, 0x10) #=> LDX $0010 mpu.memory[0x0010] = 0x80 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x80, mpu.x) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_ldx_zp_loads_x_sets_z_flag(self): mpu = MPU() mpu.x = 0xFF mpu.memory[0x0000:0x0002] = (0xA6, 0x10) #=> LDX $0010 mpu.memory[0x0010] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.x) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) # LDX Immediate def test_ldx_immediate_loads_x_sets_n_flag(self): mpu = MPU() mpu.x = 0x00 mpu.memory[0x0000:0x0002] = (0xA2, 0x80) #=> LDX #$80 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x80, mpu.x) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_ldx_immediate_loads_x_sets_z_flag(self): mpu = MPU() mpu.x = 0xFF mpu.memory[0x0000:0x0002] = (0xA2, 0x00) #=> LDX #$00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.x) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) # LDX Absolute, Y-Indexed def test_ldx_absolute_y_indexed_loads_x_sets_n_flag(self): mpu = MPU() mpu.x = 0x00 mpu.y = 0x03 mpu.memory[0x0000:0x0002] = (0xBE, 0xCD, 0xAB) #=> LDX $ABCD,Y mpu.memory[0xABCD + mpu.y] = 0x80 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x80, mpu.x) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_ldx_absolute_y_indexed_loads_x_sets_z_flag(self): mpu = MPU() mpu.x = 0xFF mpu.y = 0x03 mpu.memory[0x0000:0x0002] = (0xBE, 0xCD, 0xAB) #=> LDX $ABCD,Y mpu.memory[0xABCD + mpu.y] = 0x00 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x00, mpu.x) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) # LDX Zero Page, Y-Indexed def test_ldx_zp_y_indexed_loads_x_sets_n_flag(self): mpu = MPU() mpu.x = 0x00 mpu.y = 0x03 mpu.memory[0x0000:0x0001] = (0xB6, 0x10) #=> LDX $0010,Y mpu.memory[0x0010 + mpu.y] = 0x80 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x80, mpu.x) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_ldx_zp_y_indexed_loads_x_sets_z_flag(self): mpu = MPU() mpu.x = 0xFF mpu.y = 0x03 mpu.memory[0x0000:0x0002] = (0xB6, 0x10) #=> LDX $0010,Y mpu.memory[0x0010 + mpu.y] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.x) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) # LDY Absolute def test_ldy_absolute_loads_y_sets_n_flag(self): mpu = MPU() mpu.y = 0x00 mpu.memory[0x0000:0x0002] = (0xAC, 0xCD, 0xAB) #=> LDY $ABCD mpu.memory[0xABCD] = 0x80 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x80, mpu.y) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_ldy_absolute_loads_y_sets_z_flag(self): mpu = MPU() mpu.y = 0xFF mpu.memory[0x0000:0x0002] = (0xAC, 0xCD, 0xAB) #=> LDY $ABCD mpu.memory[0xABCD] = 0x00 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x00, mpu.y) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) # LDY Zero Page def test_ldy_zp_loads_y_sets_n_flag(self): mpu = MPU() mpu.y = 0x00 mpu.memory[0x0000:0x0002] = (0xA4, 0x10) #=> LDY $0010 mpu.memory[0x0010] = 0x80 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x80, mpu.y) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_ldy_zp_loads_y_sets_z_flag(self): mpu = MPU() mpu.y = 0xFF mpu.memory[0x0000:0x0002] = (0xA4, 0x10) #=> LDY $0010 mpu.memory[0x0010] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.y) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) # LDY Immediate def test_ldy_immediate_loads_y_sets_n_flag(self): mpu = MPU() mpu.y = 0x00 mpu.memory[0x0000:0x0002] = (0xA0, 0x80) #=> LDY #$80 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x80, mpu.y) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_ldy_immediate_loads_y_sets_z_flag(self): mpu = MPU() mpu.y = 0xFF mpu.memory[0x0000:0x0002] = (0xA0, 0x00) #=> LDY #$00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.y) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) # LDY Absolute, X-Indexed def test_ldy_absolute_x_indexed_loads_x_sets_n_flag(self): mpu = MPU() mpu.y = 0x00 mpu.x = 0x03 mpu.memory[0x0000:0x0002] = (0xBC, 0xCD, 0xAB) #=> LDY $ABCD,X mpu.memory[0xABCD + mpu.x] = 0x80 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x80, mpu.y) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_ldy_absolute_x_indexed_loads_x_sets_z_flag(self): mpu = MPU() mpu.y = 0xFF mpu.x = 0x03 mpu.memory[0x0000:0x0002] = (0xBC, 0xCD, 0xAB) #=> LDY $ABCD,X mpu.memory[0xABCD + mpu.x] = 0x00 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x00, mpu.y) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) # LDY Zero Page, X-Indexed def test_ldy_zp_x_indexed_loads_x_sets_n_flag(self): mpu = MPU() mpu.y = 0x00 mpu.x = 0x03 mpu.memory[0x0000:0x0001] = (0xB4, 0x10) #=> LDY $0010,X mpu.memory[0x0010 + mpu.x] = 0x80 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x80, mpu.y) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_ldy_zp_x_indexed_loads_x_sets_z_flag(self): mpu = MPU() mpu.y = 0xFF mpu.x = 0x03 mpu.memory[0x0000:0x0002] = (0xB4, 0x10) #=> LDY $0010,X mpu.memory[0x0010 + mpu.x] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.y) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) # LSR Accumulator def test_lsr_accumulator_rotates_in_zero_not_carry(self): mpu = MPU() mpu.flags &= mpu.CARRY mpu.memory[0x0000] = (0x4A) #=> LSR A mpu.a = 0x00 mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.CARRY) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_lsr_accumulator_sets_carry_and_zero_flags_after_rotation(self): mpu = MPU() mpu.flags &= mpu.CARRY mpu.memory[0x0000] = (0x4A) #=> LSR A mpu.a = 0x01 mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(mpu.CARRY, mpu.flags & mpu.CARRY) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_lsr_accumulator_rotates_bits_right(self): mpu = MPU() mpu.flags &= mpu.CARRY mpu.memory[0x0000] = (0x4A) #=> LSR A mpu.a = 0x04 mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0x02, mpu.a) self.assertEquals(0, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.CARRY) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) # LSR Absolute def test_lsr_absolute_rotates_in_zero_not_carry(self): mpu = MPU() mpu.flags &= mpu.CARRY mpu.memory[0x0000:0x0002] = (0x4E, 0xCD, 0xAB) #=> LSR $ABCD mpu.memory[0xABCD] = 0x00 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x00, mpu.memory[0xABCD]) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.CARRY) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_lsr_absolute_sets_carry_and_zero_flags_after_rotation(self): mpu = MPU() mpu.flags &= mpu.CARRY mpu.memory[0x0000:0x0002] = (0x4E, 0xCD, 0xAB) #=> LSR $ABCD mpu.memory[0xABCD] = 0x01 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x00, mpu.memory[0xABCD]) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(mpu.CARRY, mpu.flags & mpu.CARRY) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_lsr_absolute_rotates_bits_right(self): mpu = MPU() mpu.flags &= mpu.CARRY mpu.memory[0x0000:0x0002] = (0x4E, 0xCD, 0xAB) #=> LSR $ABCD mpu.memory[0xABCD] = 0x04 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x02, mpu.memory[0xABCD]) self.assertEquals(0, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.CARRY) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) # LSR Zero Page def test_lsr_zp_rotates_in_zero_not_carry(self): mpu = MPU() mpu.flags &= mpu.CARRY mpu.memory[0x0000:0x0001] = (0x46, 0x10) #=> LSR $0010 mpu.memory[0x0010] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.memory[0x0010]) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.CARRY) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_lsr_zp_sets_carry_and_zero_flags_after_rotation(self): mpu = MPU() mpu.flags &= mpu.CARRY mpu.memory[0x0000:0x0001] = (0x46, 0x10) #=> LSR $0010 mpu.memory[0x0010] = 0x01 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.memory[0x0010]) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(mpu.CARRY, mpu.flags & mpu.CARRY) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_lsr_zp_rotates_bits_right(self): mpu = MPU() mpu.flags &= mpu.CARRY mpu.memory[0x0000:0x0001] = (0x46, 0x10) #=> LSR $0010 mpu.memory[0x0010] = 0x04 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x02, mpu.memory[0x0010]) self.assertEquals(0, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.CARRY) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) # LSR Absolute, X-Indexed def test_lsr_absolute_x_indexed_rotates_in_zero_not_carry(self): mpu = MPU() mpu.flags &= mpu.CARRY mpu.x = 0x03 mpu.memory[0x0000:0x0002] = (0x5E, 0xCD, 0xAB) #=> LSR $ABCD,X mpu.memory[0xABCD + mpu.x] = 0x00 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x00, mpu.memory[0xABCD + mpu.x]) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.CARRY) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_lsr_absolute_x_indexed_sets_carry_and_zero_flags_after_rotation(self): mpu = MPU() mpu.flags &= mpu.CARRY mpu.x = 0x03 mpu.memory[0x0000:0x0002] = (0x5E, 0xCD, 0xAB) #=> LSR $ABCD,X mpu.memory[0xABCD + mpu.x] = 0x01 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x00, mpu.memory[0xABCD + mpu.x]) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(mpu.CARRY, mpu.flags & mpu.CARRY) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_lsr_absolute_x_indexed_rotates_bits_right(self): mpu = MPU() mpu.flags &= mpu.CARRY mpu.memory[0x0000:0x0002] = (0x5E, 0xCD, 0xAB) #=> LSR $ABCD,X mpu.memory[0xABCD + mpu.x] = 0x04 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x02, mpu.memory[0xABCD + mpu.x]) self.assertEquals(0, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.CARRY) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) # LSR Zero Page, X-Indexed def test_lsr_zp_x_indexed_rotates_in_zero_not_carry(self): mpu = MPU() mpu.flags &= mpu.CARRY mpu.x = 0x03 mpu.memory[0x0000:0x0001] = (0x56, 0x10) #=> LSR $0010,X mpu.memory[0x0010 + mpu.x] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.memory[0x0010 + mpu.x]) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.CARRY) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_lsr_zp_x_indexed_sets_carry_and_zero_flags_after_rotation(self): mpu = MPU() mpu.flags &= mpu.CARRY mpu.x = 0x03 mpu.memory[0x0000:0x0001] = (0x56, 0x10) #=> LSR $0010,X mpu.memory[0x0010 + mpu.x] = 0x01 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.memory[0x0010 + mpu.x]) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(mpu.CARRY, mpu.flags & mpu.CARRY) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_lsr_zp_x_indexed_rotates_bits_right(self): mpu = MPU() mpu.flags &= mpu.CARRY mpu.x = 0x03 mpu.memory[0x0000:0x0001] = (0x56, 0x10) #=> LSR $0010,X mpu.memory[0x0010 + mpu.x] = 0x04 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x02, mpu.memory[0x0010 + mpu.x]) self.assertEquals(0, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.CARRY) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) # NOP def test_nop_does_nothing(self): mpu = MPU() mpu.memory[0x0000] = 0xEA #=> NOP mpu.step() self.assertEquals(0x0001, mpu.pc) # ORA Absolute def test_ora_absolute_zeroes_or_zeros_sets_z_flag(self): mpu = MPU() mpu.flags &= ~(mpu.ZERO) mpu.a = 0x00 mpu.memory[0x0000:0x0001] = (0x0D, 0xCD, 0xAB) #=> ORA $ABCD mpu.memory[0xABCD] = 0x00 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) def test_ora_absolute_turns_bits_on_sets_n_flag(self): mpu = MPU() mpu.flags &= ~(mpu.NEGATIVE) mpu.a = 0x03 mpu.memory[0x0000:0x0001] = (0x0D, 0xCD, 0xAB) #=> ORA $ABCD mpu.memory[0xABCD] = 0x82 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x83, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) # ORA Zero Page def test_ora_zp_zeroes_or_zeros_sets_z_flag(self): mpu = MPU() mpu.flags &= ~(mpu.ZERO) mpu.a = 0x00 mpu.memory[0x0000:0x0001] = (0x05, 0x10) #=> ORA $0010 mpu.memory[0x0010] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) def test_ora_zp_turns_bits_on_sets_n_flag(self): mpu = MPU() mpu.flags &= ~(mpu.NEGATIVE) mpu.a = 0x03 mpu.memory[0x0000:0x0001] = (0x05, 0x10) #=> ORA $0010 mpu.memory[0x0010] = 0x82 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x83, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) # ORA Immediate def test_ora_immediate_zeroes_or_zeros_sets_z_flag(self): mpu = MPU() mpu.flags &= ~(mpu.ZERO) mpu.a = 0x00 mpu.memory[0x0000:0x0001] = (0x09, 0x00) #=> ORA #$00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) def test_ora_immediate_turns_bits_on_sets_n_flag(self): mpu = MPU() mpu.flags &= ~(mpu.NEGATIVE) mpu.a = 0x03 mpu.memory[0x0000:0x0001] = (0x09, 0x82) #=> ORA #$82 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x83, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) # ORA Absolute, X def test_ora_absolute_x_indexed_zeroes_or_zeros_sets_z_flag(self): mpu = MPU() mpu.flags &= ~(mpu.ZERO) mpu.a = 0x00 mpu.x = 0x03 mpu.memory[0x0000:0x0002] = (0x1D, 0xCD, 0xAB) #=> ORA $ABCD,X mpu.memory[0xABCD + mpu.x] = 0x00 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) def test_ora_absolute_x_indexed_turns_bits_on_sets_n_flag(self): mpu = MPU() mpu.flags &= ~(mpu.NEGATIVE) mpu.a = 0x03 mpu.x = 0x03 mpu.memory[0x0000:0x0002] = (0x1D, 0xCD, 0xAB) #=> ORA $ABCD,X mpu.memory[0xABCD + mpu.x] = 0x82 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x83, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) # ORA Absolute, Y def test_ora_absolute_y_indexed_zeroes_or_zeros_sets_z_flag(self): mpu = MPU() mpu.flags &= ~(mpu.ZERO) mpu.a = 0x00 mpu.y = 0x03 mpu.memory[0x0000:0x0002] = (0x19, 0xCD, 0xAB) #=> ORA $ABCD,Y mpu.memory[0xABCD + mpu.y] = 0x00 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) def test_ora_absolute_y_indexed_turns_bits_on_sets_n_flag(self): mpu = MPU() mpu.flags &= ~(mpu.NEGATIVE) mpu.a = 0x03 mpu.y = 0x03 mpu.memory[0x0000:0x0002] = (0x19, 0xCD, 0xAB) #=> ORA $ABCD,Y mpu.memory[0xABCD + mpu.y] = 0x82 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x83, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) # ORA Indirect, Indexed (X) def test_ora_indirect_indexed_x_zeroes_or_zeros_sets_z_flag(self): mpu = MPU() mpu.flags &= ~(mpu.ZERO) mpu.a = 0x00 mpu.x = 0x03 mpu.memory[0x0000:0x0001] = (0x01, 0x10) #=> ORA ($0010,X) mpu.memory[0x0013:0x0014] = (0xCD, 0xAB) #=> Vector to $ABCD mpu.memory[0xABCD] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) def test_ora_indirect_indexed_x_turns_bits_on_sets_n_flag(self): mpu = MPU() mpu.flags &= ~(mpu.NEGATIVE) mpu.a = 0x03 mpu.x = 0x03 mpu.memory[0x0000:0x0001] = (0x01, 0x10) #=> ORA ($ABCD,X) mpu.memory[0x0013:0x0014] = (0xCD, 0xAB) #=> Vector to $ABCD mpu.memory[0xABCD] = 0x82 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x83, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) # ORA Indexed, Indirect (Y) def test_ora_indexed_indirect_y_zeroes_or_zeros_sets_z_flag(self): mpu = MPU() mpu.flags &= ~(mpu.ZERO) mpu.a = 0x00 mpu.y = 0x03 mpu.memory[0x0000:0x0001] = (0x11, 0x10) #=> ORA ($0010),Y mpu.memory[0x0010:0x0011] = (0xCD, 0xAB) #=> Vector to $ABCD mpu.memory[0xABCD + mpu.y] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) def test_ora_indexed_indirect_y_turns_bits_on_sets_n_flag(self): mpu = MPU() mpu.flags &= ~(mpu.NEGATIVE) mpu.a = 0x03 mpu.y = 0x03 mpu.memory[0x0000:0x0001] = (0x11, 0x10) #=> ORA ($0010),Y mpu.memory[0x0010:0x0011] = (0xCD, 0xAB) #=> Vector to $ABCD mpu.memory[0xABCD + mpu.y] = 0x82 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x83, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) # ORA Zero Page, X def test_ora_zp_x_indexed_zeroes_or_zeros_sets_z_flag(self): mpu = MPU() mpu.flags &= ~(mpu.ZERO) mpu.a = 0x00 mpu.x = 0x03 mpu.memory[0x0000:0x0001] = (0x15, 0x10) #=> ORA $0010,X mpu.memory[0x0010 + mpu.x] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) def test_ora_zp_x_indexed_turns_bits_on_sets_n_flag(self): mpu = MPU() mpu.flags &= ~(mpu.NEGATIVE) mpu.a = 0x03 mpu.x = 0x03 mpu.memory[0x0000:0x0001] = (0x15, 0x10) #=> ORA $0010,X mpu.memory[0x0010 + mpu.x] = 0x82 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x83, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) # PHA def test_pha_pushes_a_and_updates_sp(self): mpu = MPU() mpu.a = 0xAB mpu.memory[0x0000] = 0x48 #=> PHA mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0xAB, mpu.a) self.assertEquals(0xAB, mpu.memory[0x01FF]) self.assertEquals(0xFE, mpu.sp) # PHP def test_php_pushes_processor_status_and_updates_sp(self): mpu = MPU() flags = (mpu.NEGATIVE | mpu.OVERFLOW | mpu.DECIMAL | mpu.ZERO | mpu.CARRY) mpu.flags = flags mpu.memory[0x0000] = 0x08 #=> PHP mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(flags, mpu.memory[0x1FF]) self.assertEquals(0xFE, mpu.sp) # PLA def test_pla_pulls_top_byte_from_stack_into_a_and_updates_sp(self): mpu = MPU() mpu.memory[0x0000] = 0x68 #=> PLA mpu.memory[0x01FF] = 0xAB mpu.sp = 0xFE mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0xAB, mpu.a) self.assertEquals(0xFF, mpu.sp) # PLP def test_plp_pulls_top_byte_from_stack_into_flags_and_updates_sp(self): mpu = MPU() mpu.memory[0x0000] = 0x28 #=> PLP mpu.memory[0x01FF] = 0xAB mpu.sp = 0xFE mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0xAB, mpu.flags) self.assertEquals(0xFF, mpu.sp) # ROL Accumulator def test_rol_accumulator_zero_and_carry_zero_sets_z_flag(self): mpu = MPU() mpu.a = 0x00 mpu.flags &= ~(mpu.CARRY) mpu.memory[0x0000] = 0x2A #=> ROL A mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_rol_accumulator_zero_and_carry_one_clears_z_flag(self): mpu = MPU() mpu.a = 0x00 mpu.flags |= mpu.CARRY mpu.memory[0x0000] = 0x2A #=> ROL A mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0x01, mpu.a) self.assertEquals(0, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_rol_accumulator_sets_n_flag(self): mpu = MPU() mpu.a = 0x40 mpu.flags |= mpu.CARRY mpu.memory[0x0000] = 0x2A #=> ROL A mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0x81, mpu.a) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_rol_accumulator_shifts_out_zero(self): mpu = MPU() mpu.a = 0x7F mpu.flags &= ~(mpu.CARRY) mpu.memory[0x0000] = 0x0A #=> ROL A mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0xFE, mpu.a) self.assertEquals(0, mpu.flags & mpu.CARRY) def test_rol_accumulator_shifts_out_one(self): mpu = MPU() mpu.a = 0xFF mpu.flags &= ~(mpu.CARRY) mpu.memory[0x0000] = 0x2A #=> ROL A mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0xFE, mpu.a) self.assertEquals(mpu.CARRY, mpu.flags & mpu.CARRY) # ROL Absolute def test_rol_absolute_zero_and_carry_zero_sets_z_flag(self): mpu = MPU() mpu.flags &= ~(mpu.CARRY) mpu.memory[0x0000:0x0002] = (0x2E, 0xCD, 0xAB) #=> ROL $ABCD mpu.memory[0xABCD] = 0x00 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x00, mpu.memory[0xABCD]) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_rol_absolute_zero_and_carry_one_clears_z_flag(self): mpu = MPU() mpu.a = 0x00 mpu.flags |= mpu.CARRY mpu.memory[0x0000:0x0002] = (0x2E, 0xCD, 0xAB) #=> ROL $ABCD mpu.memory[0xABCD] = 0x00 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x01, mpu.memory[0xABCD]) self.assertEquals(0, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_rol_absolute_sets_n_flag(self): mpu = MPU() mpu.flags |= mpu.CARRY mpu.memory[0x0000:0x0002] = (0x2E, 0xCD, 0xAB) #=> ROL $ABCD mpu.memory[0xABCD] = 0x40 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x81, mpu.memory[0xABCD]) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_rol_absolute_shifts_out_zero(self): mpu = MPU() mpu.flags &= ~(mpu.CARRY) mpu.memory[0x0000:0x0002] = (0x2E, 0xCD, 0xAB) #=> ROL $ABCD mpu.memory[0xABCD] = 0x7F mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0xFE, mpu.memory[0xABCD]) self.assertEquals(0, mpu.flags & mpu.CARRY) def test_rol_absolute_shifts_out_one(self): mpu = MPU() mpu.flags &= ~(mpu.CARRY) mpu.memory[0x0000:0x0002] = (0x2E, 0xCD, 0xAB) #=> ROL $ABCD mpu.memory[0xABCD] = 0xFF mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0xFE, mpu.memory[0xABCD]) self.assertEquals(mpu.CARRY, mpu.flags & mpu.CARRY) # ROL Zero Page def test_rol_zp_zero_and_carry_zero_sets_z_flag(self): mpu = MPU() mpu.flags &= ~(mpu.CARRY) mpu.memory[0x0000:0x0001] = (0x26, 0x10) #=> ROL $0010 mpu.memory[0x0010] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.memory[0x0010]) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_rol_zp_zero_and_carry_one_clears_z_flag(self): mpu = MPU() mpu.a = 0x00 mpu.flags |= mpu.CARRY mpu.memory[0x0000:0x0001] = (0x26, 0x10) #=> ROL $0010 mpu.memory[0x0010] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x01, mpu.memory[0x0010]) self.assertEquals(0, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_rol_zp_sets_n_flag(self): mpu = MPU() mpu.flags |= mpu.CARRY mpu.memory[0x0000:0x0001] = (0x26, 0x10) #=> ROL $0010 mpu.memory[0x0010] = 0x40 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x81, mpu.memory[0x0010]) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_rol_zp_shifts_out_zero(self): mpu = MPU() mpu.flags &= ~(mpu.CARRY) mpu.memory[0x0000:0x0001] = (0x26, 0x10) #=> ROL $0010 mpu.memory[0x0010] = 0x7F mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0xFE, mpu.memory[0x0010]) self.assertEquals(0, mpu.flags & mpu.CARRY) def test_rol_zp_shifts_out_one(self): mpu = MPU() mpu.flags &= ~(mpu.CARRY) mpu.memory[0x0000:0x0001] = (0x26, 0x10) #=> ROL $0010 mpu.memory[0x0010] = 0xFF mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0xFE, mpu.memory[0x0010]) self.assertEquals(mpu.CARRY, mpu.flags & mpu.CARRY) # ROL Absolute, X-Indexed def test_rol_absolute_x_indexed_zero_and_carry_zero_sets_z_flag(self): mpu = MPU() mpu.flags &= ~(mpu.CARRY) mpu.x = 0x03 mpu.memory[0x0000:0x0002] = (0x3E, 0xCD, 0xAB) #=> ROL $ABCD,X mpu.memory[0xABCD + mpu.x] = 0x00 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x00, mpu.memory[0xABCD + mpu.x]) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_rol_absolute_x_indexed_zero_and_carry_one_clears_z_flag(self): mpu = MPU() mpu.x = 0x03 mpu.flags |= mpu.CARRY mpu.memory[0x0000:0x0002] = (0x3E, 0xCD, 0xAB) #=> ROL $ABCD,X mpu.memory[0xABCD + mpu.x] = 0x00 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x01, mpu.memory[0xABCD + mpu.x]) self.assertEquals(0, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_rol_absolute_x_indexed_sets_n_flag(self): mpu = MPU() mpu.x = 0x03 mpu.flags |= mpu.CARRY mpu.memory[0x0000:0x0002] = (0x3E, 0xCD, 0xAB) #=> ROL $ABCD,X mpu.memory[0xABCD + mpu.x] = 0x40 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x81, mpu.memory[0xABCD + mpu.x]) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_rol_absolute_x_indexed_shifts_out_zero(self): mpu = MPU() mpu.x = 0x03 mpu.flags &= ~(mpu.CARRY) mpu.memory[0x0000:0x0002] = (0x3E, 0xCD, 0xAB) #=> ROL $ABCD,X mpu.memory[0xABCD + mpu.x] = 0x7F mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0xFE, mpu.memory[0xABCD + mpu.x]) self.assertEquals(0, mpu.flags & mpu.CARRY) def test_rol_absolute_x_indexed_shifts_out_one(self): mpu = MPU() mpu.x = 0x03 mpu.flags &= ~(mpu.CARRY) mpu.memory[0x0000:0x0002] = (0x3E, 0xCD, 0xAB) #=> ROL $ABCD,X mpu.memory[0xABCD + mpu.x] = 0xFF mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0xFE, mpu.memory[0xABCD + mpu.x]) self.assertEquals(mpu.CARRY, mpu.flags & mpu.CARRY) # ROL Zero Page, X-Indexed def test_rol_zp_x_indexed_zero_and_carry_zero_sets_z_flag(self): mpu = MPU() mpu.flags &= ~(mpu.CARRY) mpu.x = 0x03 mpu.memory[0x0000:0x0001] = (0x36, 0x10) #=> ROL $0010,X mpu.memory[0x0010 + mpu.x] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.memory[0x0010 + mpu.x]) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_rol_zp_x_indexed_zero_and_carry_one_clears_z_flag(self): mpu = MPU() mpu.x = 0x03 mpu.flags |= mpu.CARRY mpu.memory[0x0000:0x0001] = (0x36, 0x10) #=> ROL $0010,X mpu.memory[0x0010 + mpu.x] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x01, mpu.memory[0x0010 + mpu.x]) self.assertEquals(0, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_rol_zp_x_indexed_sets_n_flag(self): mpu = MPU() mpu.x = 0x03 mpu.flags |= mpu.CARRY mpu.memory[0x0000:0x0001] = (0x36, 0x10) #=> ROL $0010,X mpu.memory[0x0010 + mpu.x] = 0x40 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x81, mpu.memory[0x0010 + mpu.x]) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) def test_rol_zp_x_indexed_shifts_out_zero(self): mpu = MPU() mpu.x = 0x03 mpu.flags &= ~(mpu.CARRY) mpu.memory[0x0000:0x0001] = (0x36, 0x10) #=> ROL $0010,X mpu.memory[0x0010 + mpu.x] = 0x7F mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0xFE, mpu.memory[0x0010 + mpu.x]) self.assertEquals(0, mpu.flags & mpu.CARRY) def test_rol_zp_x_indexed_shifts_out_one(self): mpu = MPU() mpu.x = 0x03 mpu.flags &= ~(mpu.CARRY) mpu.memory[0x0000:0x0001] = (0x36, 0x10) #=> ROL $0010,X mpu.memory[0x0010 + mpu.x] = 0xFF mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0xFE, mpu.memory[0x0010 + mpu.x]) self.assertEquals(mpu.CARRY, mpu.flags & mpu.CARRY) # ROR Accumulator def test_ror_accumulator_zero_and_carry_zero_sets_z_flag(self): mpu = MPU() mpu.a = 0x00 mpu.flags &= ~(mpu.CARRY) mpu.memory[0x0000] = 0x6A #=> ROR A mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_ror_accumulator_zero_and_carry_one_rotates_in_sets_n_flags(self): mpu = MPU() mpu.a = 0x00 mpu.flags |= mpu.CARRY mpu.memory[0x0000] = 0x6A #=> ROR A mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0x80, mpu.a) self.assertEquals(0, mpu.flags & mpu.ZERO) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) def test_ror_accumulator_shifts_out_zero(self): mpu = MPU() mpu.a = 0x02 mpu.flags |= mpu.CARRY mpu.memory[0x0000] = 0x6A #=> ROR A mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0x81, mpu.a) self.assertEquals(0, mpu.flags & mpu.CARRY) def test_ror_accumulator_shifts_out_one(self): mpu = MPU() mpu.a = 0x03 mpu.flags |= mpu.CARRY mpu.memory[0x0000] = 0x6A #=> ROR A mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0x81, mpu.a) self.assertEquals(mpu.CARRY, mpu.flags & mpu.CARRY) # ROR Absolute def test_ror_absolute_zero_and_carry_zero_sets_z_flag(self): mpu = MPU() mpu.flags &= ~(mpu.CARRY) mpu.memory[0x0000:0x0002] = (0x6E, 0xCD, 0xAB) #=> ROR $ABCD mpu.memory[0xABCD] = 0x00 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x00, mpu.memory[0xABCD]) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_ror_absolute_zero_and_carry_one_rotates_in_sets_n_flags(self): mpu = MPU() mpu.flags |= mpu.CARRY mpu.memory[0x0000:0x0002] = (0x6E, 0xCD, 0xAB) #=> ROR $ABCD mpu.memory[0xABCD] = 0x00 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x80, mpu.memory[0xABCD]) self.assertEquals(0, mpu.flags & mpu.ZERO) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) def test_ror_absolute_shifts_out_zero(self): mpu = MPU() mpu.flags |= mpu.CARRY mpu.memory[0x0000:0x0002] = (0x6E, 0xCD, 0xAB) #=> ROR $ABCD mpu.memory[0xABCD] = 0x02 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x81, mpu.memory[0xABCD]) self.assertEquals(0, mpu.flags & mpu.CARRY) def test_ror_absolute_shifts_out_one(self): mpu = MPU() mpu.flags |= mpu.CARRY mpu.memory[0x0000:0x0002] = (0x6E, 0xCD, 0xAB) #=> ROR $ABCD mpu.memory[0xABCD] = 0x03 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x81, mpu.memory[0xABCD]) self.assertEquals(mpu.CARRY, mpu.flags & mpu.CARRY) # ROR Zero Page def test_ror_zp_zero_and_carry_zero_sets_z_flag(self): mpu = MPU() mpu.flags &= ~(mpu.CARRY) mpu.memory[0x0000:0x0001] = (0x66, 0x10) #=> ROR $0010 mpu.memory[0x0010] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.memory[0x0010]) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_ror_zp_zero_and_carry_one_rotates_in_sets_n_flags(self): mpu = MPU() mpu.flags |= mpu.CARRY mpu.memory[0x0000:0x0001] = (0x66, 0x10) #=> ROR $0010 mpu.memory[0x0010] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x80, mpu.memory[0x0010]) self.assertEquals(0, mpu.flags & mpu.ZERO) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) def test_ror_zp_zero_absolute_shifts_out_zero(self): mpu = MPU() mpu.flags |= mpu.CARRY mpu.memory[0x0000:0x0001] = (0x66, 0x10) #=> ROR $0010 mpu.memory[0x0010] = 0x02 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x81, mpu.memory[0x0010]) self.assertEquals(0, mpu.flags & mpu.CARRY) def test_ror_zp_shifts_out_one(self): mpu = MPU() mpu.flags |= mpu.CARRY mpu.memory[0x0000:0x0001] = (0x66, 0x10) #=> ROR $0010 mpu.memory[0x0010] = 0x03 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x81, mpu.memory[0x0010]) self.assertEquals(mpu.CARRY, mpu.flags & mpu.CARRY) # ROR Absolute, X-Indexed def test_ror_absolute_x_indexed_zero_and_carry_zero_sets_z_flag(self): mpu = MPU() mpu.x = 0x03 mpu.flags &= ~(mpu.CARRY) mpu.memory[0x0000:0x0002] = (0x7E, 0xCD, 0xAB) #=> ROR $ABCD,X mpu.memory[0xABCD + mpu.x] = 0x00 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x00, mpu.memory[0xABCD + mpu.x]) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_ror_absolute_x_indexed_zero_and_carry_one_rotates_in_sets_n_flags(self): mpu = MPU() mpu.x = 0x03 mpu.flags |= mpu.CARRY mpu.memory[0x0000:0x0002] = (0x7E, 0xCD, 0xAB) #=> ROR $ABCD,X mpu.memory[0xABCD + mpu.x] = 0x00 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x80, mpu.memory[0xABCD + mpu.x]) self.assertEquals(0, mpu.flags & mpu.ZERO) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) def test_ror_absolute_x_indexed_shifts_out_zero(self): mpu = MPU() mpu.x = 0x03 mpu.flags |= mpu.CARRY mpu.memory[0x0000:0x0002] = (0x7E, 0xCD, 0xAB) #=> ROR $ABCD,X mpu.memory[0xABCD + mpu.x] = 0x02 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x81, mpu.memory[0xABCD + mpu.x]) self.assertEquals(0, mpu.flags & mpu.CARRY) def test_ror_absolute_x_indexed_shifts_out_one(self): mpu = MPU() mpu.x = 0x03 mpu.flags |= mpu.CARRY mpu.memory[0x0000:0x0002] = (0x7E, 0xCD, 0xAB) #=> ROR $ABCD,X mpu.memory[0xABCD + mpu.x] = 0x03 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x81, mpu.memory[0xABCD + mpu.x]) self.assertEquals(mpu.CARRY, mpu.flags & mpu.CARRY) # ROR Zero Page, X-Indexed def test_ror_zp_x_indexed_zero_and_carry_zero_sets_z_flag(self): mpu = MPU() mpu.x = 0x03 mpu.flags &= ~(mpu.CARRY) mpu.memory[0x0000:0x0001] = (0x76, 0x10) #=> ROR $0010,X mpu.memory[0x0010 + mpu.x] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.memory[0x0010 + mpu.x]) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_ror_zp_x_indexed_zero_and_carry_one_rotates_in_sets_n_flags(self): mpu = MPU() mpu.x = 0x03 mpu.flags |= mpu.CARRY mpu.memory[0x0000:0x0001] = (0x76, 0x10) #=> ROR $0010,X mpu.memory[0x0010 + mpu.x] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x80, mpu.memory[0x0010 + mpu.x]) self.assertEquals(0, mpu.flags & mpu.ZERO) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) def test_ror_zp_x_indexed_zero_absolute_shifts_out_zero(self): mpu = MPU() mpu.x = 0x03 mpu.flags |= mpu.CARRY mpu.memory[0x0000:0x0001] = (0x76, 0x10) #=> ROR $0010,X mpu.memory[0x0010 + mpu.x] = 0x02 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x81, mpu.memory[0x0010 + mpu.x]) self.assertEquals(0, mpu.flags & mpu.CARRY) def test_ror_zp_x_indexed_shifts_out_one(self): mpu = MPU() mpu.x = 0x03 mpu.flags |= mpu.CARRY mpu.memory[0x0000:0x0001] = (0x76, 0x10) #=> ROR $0010,X mpu.memory[0x0010 + mpu.x] = 0x03 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x81, mpu.memory[0x0010 + mpu.x]) self.assertEquals(mpu.CARRY, mpu.flags & mpu.CARRY) # RTI def test_rti_restores_status_register_and_program_counter_and_updates_sp(self): mpu = MPU() mpu.memory[0x0000] = 0x40 #=> RTI mpu.memory[0x01FD:0x01FF] = (0xAB, 0x03, 0xC0) # Status (P), PCL, PCH mpu.sp = 0xFC mpu.step() self.assertEquals(0xC003, mpu.pc) self.assertEquals(0xAB, mpu.flags) self.assertEquals(0xFF, mpu.sp) # RTS def test_rts_restores_program_counter_and_increments_then_updates_sp(self): mpu = MPU() mpu.memory[0x0000] = 0x60 #=> RTS mpu.memory[0x01FE:0x01FF] = (0x03, 0xC0) # PCL, PCH mpu.sp = 0xFD mpu.step() self.assertEquals(0xC004, mpu.pc) self.assertEquals(0xFF, mpu.sp) # SBC def test_sbc_abs_all_zeros_and_no_borrow_is_zero(self): mpu = MPU() mpu.flags &= ~(mpu.DECIMAL) mpu.flags |= mpu.CARRY # borrow = 0 mpu.a = 0x00 mpu.memory[0x0000:0x0002] = (0xED, 0xCD, 0xAB) #=> SBC $ABCD mpu.memory[0xABCD] = 0x00 mpu.step() self.assertEquals(0x00, mpu.a) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) self.assertEquals(mpu.CARRY, mpu.CARRY) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) def test_sbc_abs_downto_zero_no_borrow_sets_z_clears_n(self): mpu = MPU() mpu.flags &= ~(mpu.DECIMAL) mpu.flags |= mpu.CARRY # borrow = 0 mpu.a = 0x01 mpu.memory[0x0000:0x0002] = (0xED, 0xCD, 0xAB) #=> SBC $ABCD mpu.memory[0xABCD] = 0x01 mpu.step() self.assertEquals(0x00, mpu.a) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) self.assertEquals(mpu.CARRY, mpu.CARRY) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) def test_sbc_abs_downto_zero_with_borrow_sets_z_clears_n(self): mpu = MPU() mpu.flags &= ~(mpu.DECIMAL) mpu.flags &= ~(mpu.CARRY) # borrow = 1 mpu.a = 0x01 mpu.memory[0x0000:0x0002] = (0xED, 0xCD, 0xAB) #=> SBC $ABCD mpu.memory[0xABCD] = 0x00 mpu.step() self.assertEquals(0x00, mpu.a) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) self.assertEquals(mpu.CARRY, mpu.CARRY) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) def test_sbc_abs_downto_four_with_borrow_clears_z_n(self): mpu = MPU() mpu.flags &= ~(mpu.DECIMAL) mpu.flags &= ~(mpu.CARRY) # borrow = 1 mpu.a = 0x07 mpu.memory[0x0000:0x0002] = (0xED, 0xCD, 0xAB) #=> SBC $ABCD mpu.memory[0xABCD] = 0x02 mpu.step() self.assertEquals(0x04, mpu.a) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) self.assertEquals(0, mpu.flags & mpu.ZERO) self.assertEquals(mpu.CARRY, mpu.CARRY) # SEC def test_sec_sets_carry_flag(self): mpu = MPU() mpu.flags &= ~(mpu.CARRY) mpu.memory[0x0000] = 0x038 #=> SEC mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(mpu.CARRY, mpu.flags & mpu.CARRY) # SED def test_sed_sets_decimal_mode_flag(self): mpu = MPU() mpu.flags &= ~(mpu.DECIMAL) mpu.memory[0x0000] = 0xF8 #=> SED mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(mpu.DECIMAL, mpu.flags & mpu.DECIMAL) # SEI def test_sei_sets_interrupt_disable_flag(self): mpu = MPU() mpu.flags &= ~(mpu.INTERRUPT) mpu.memory[0x0000] = 0x78 #=> SEI mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(mpu.INTERRUPT, mpu.flags & mpu.INTERRUPT) # STA Absolute def test_sta_absolute_stores_a_leaves_a_and_n_flag_unchanged(self): mpu = MPU() mpu.flags = flags = 0xFF & ~(mpu.NEGATIVE) mpu.a = 0xFF mpu.memory[0x0000:0x0002] = (0x8D, 0xCD, 0xAB) #=> STA $ABCD mpu.memory[0xABCD] = 0x00 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0xFF, mpu.memory[0xABCD]) self.assertEquals(0xFF, mpu.a) self.assertEquals(flags, mpu.flags) def test_sta_absolute_stores_a_leaves_a_and_z_flag_unchanged(self): mpu = MPU() mpu.flags = flags = 0xFF & ~(mpu.ZERO) mpu.a = 0x00 mpu.memory[0x0000:0x0002] = (0x8D, 0xCD, 0xAB) #=> STA $ABCD mpu.memory[0xABCD] = 0xFF mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x00, mpu.memory[0xABCD]) self.assertEquals(0x00, mpu.a) self.assertEquals(flags, mpu.flags) # STA Zero Page def test_sta_zp_stores_a_leaves_a_and_n_flag_unchanged(self): mpu = MPU() mpu.flags = flags = 0xFF & ~(mpu.NEGATIVE) mpu.a = 0xFF mpu.memory[0x0000:0x0001] = (0x85, 0x10) #=> STA $0010 mpu.memory[0x0010] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0xFF, mpu.memory[0x0010]) self.assertEquals(0xFF, mpu.a) self.assertEquals(flags, mpu.flags) def test_sta_zp_stores_a_leaves_a_and_z_flag_unchanged(self): mpu = MPU() mpu.flags = flags = 0xFF & ~(mpu.ZERO) mpu.a = 0x00 mpu.memory[0x0000:0x0001] = (0x85, 0x10) #=> STA $0010 mpu.memory[0x0010] = 0xFF mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.memory[0x0010]) self.assertEquals(0x00, mpu.a) self.assertEquals(flags, mpu.flags) # STA Absolute, X-Indexed def test_sta_absolute_x_indexed_stores_a_leaves_a_and_n_flag_unchanged(self): mpu = MPU() mpu.flags = flags = 0xFF & ~(mpu.NEGATIVE) mpu.a = 0xFF mpu.x = 0x03 mpu.memory[0x0000:0x0002] = (0x9D, 0xCD, 0xAB) #=> STA $ABCD,X mpu.memory[0xABCD + mpu.x] = 0x00 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0xFF, mpu.memory[0xABCD + mpu.x]) self.assertEquals(0xFF, mpu.a) self.assertEquals(flags, mpu.flags) def test_sta_absolute_x_indexed_stores_a_leaves_a_and_z_flag_unchanged(self): mpu = MPU() mpu.flags = flags = 0xFF & ~(mpu.ZERO) mpu.a = 0x00 mpu.x = 0x03 mpu.memory[0x0000:0x0002] = (0x9D, 0xCD, 0xAB) #=> STA $ABCD,X mpu.memory[0xABCD + mpu.x] = 0xFF mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x00, mpu.memory[0xABCD + mpu.x]) self.assertEquals(0x00, mpu.a) self.assertEquals(flags, mpu.flags) # STA Absolute, Y-Indexed def test_sta_absolute_y_indexed_stores_a_leaves_a_and_n_flag_unchanged(self): mpu = MPU() mpu.flags = flags = 0xFF & ~(mpu.NEGATIVE) mpu.a = 0xFF mpu.y = 0x03 mpu.memory[0x0000:0x0002] = (0x99, 0xCD, 0xAB) #=> STA $ABCD,Y mpu.memory[0xABCD + mpu.y] = 0x00 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0xFF, mpu.memory[0xABCD + mpu.y]) self.assertEquals(0xFF, mpu.a) self.assertEquals(flags, mpu.flags) def test_sta_absolute_y_indexed_stores_a_leaves_a_and_z_flag_unchanged(self): mpu = MPU() mpu.flags = flags = 0xFF & ~(mpu.ZERO) mpu.a = 0x00 mpu.y = 0x03 mpu.memory[0x0000:0x0002] = (0x99, 0xCD, 0xAB) #=> STA $ABCD,Y mpu.memory[0xABCD + mpu.y] = 0xFF mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x00, mpu.memory[0xABCD + mpu.y]) self.assertEquals(0x00, mpu.a) self.assertEquals(flags, mpu.flags) # STA Indirect, Indexed (X) def test_sta_indirect_indexed_x_stores_a_leaves_a_and_n_flag_unchanged(self): mpu = MPU() mpu.flags = flags = 0xFF & ~(mpu.NEGATIVE) mpu.a = 0xFF mpu.x = 0x03 mpu.memory[0x0000:0x0001] = (0x81, 0x10) #=> STA ($0010,X) mpu.memory[0x0013:0x0014] = (0xED, 0xFE) #=> Vector to $FEED mpu.memory[0xFEED] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0xFF, mpu.memory[0xFEED]) self.assertEquals(0xFF, mpu.a) self.assertEquals(flags, mpu.flags) def test_sta_indirect_indexed_x_stores_a_leaves_a_and_z_flag_unchanged(self): mpu = MPU() mpu.flags = flags = 0xFF & ~(mpu.ZERO) mpu.a = 0x00 mpu.x = 0x03 mpu.memory[0x0000:0x0001] = (0x81, 0x10) #=> STA ($0010,X) mpu.memory[0x0013:0x0014] = (0xED, 0xFE) #=> Vector to $FEED mpu.memory[0xFEED] = 0xFF mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.memory[0xFEED]) self.assertEquals(0x00, mpu.a) self.assertEquals(flags, mpu.flags) # STA Indexed, Indirect (Y) def test_sta_indexed_indirect_y_stores_a_leaves_a_and_n_flag_unchanged(self): mpu = MPU() mpu.flags = flags = 0xFF & ~(mpu.NEGATIVE) mpu.a = 0xFF mpu.y = 0x03 mpu.memory[0x0000:0x0001] = (0x91, 0x10) #=> STA ($0010),Y mpu.memory[0x0010:0x0011] = (0xED, 0xFE) #=> Vector to $FEED mpu.memory[0xFEED + mpu.y] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0xFF, mpu.memory[0xFEED + mpu.y]) self.assertEquals(0xFF, mpu.a) self.assertEquals(flags, mpu.flags) def test_sta_indexed_indirect_y_stores_a_leaves_a_and_z_flag_unchanged(self): mpu = MPU() mpu.flags = flags = 0xFF & ~(mpu.ZERO) mpu.a = 0x00 mpu.y = 0x03 mpu.memory[0x0000:0x0001] = (0x91, 0x10) #=> STA ($0010),Y mpu.memory[0x0010:0x0011] = (0xED, 0xFE) #=> Vector to $FEED mpu.memory[0xFEED + mpu.y] = 0xFF mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.memory[0xFEED + mpu.y]) self.assertEquals(0x00, mpu.a) self.assertEquals(flags, mpu.flags) # STA Zero Page, X-Indexed def test_sta_zp_x_indexed_stores_a_leaves_a_and_n_flag_unchanged(self): mpu = MPU() mpu.flags = flags = 0xFF & ~(mpu.NEGATIVE) mpu.a = 0xFF mpu.x = 0x03 mpu.memory[0x0000:0x0002] = (0x95, 0x10) #=> STA $0010,X mpu.memory[0x0010 + mpu.x] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0xFF, mpu.memory[0x0010 + mpu.x]) self.assertEquals(0xFF, mpu.a) self.assertEquals(flags, mpu.flags) def test_sta_zp_x_indexed_stores_a_leaves_a_and_z_flag_unchanged(self): mpu = MPU() mpu.flags = flags = 0xFF & ~(mpu.ZERO) mpu.a = 0x00 mpu.x = 0x03 mpu.memory[0x0000:0x0002] = (0x95, 0x10) #=> STA $0010,X mpu.memory[0x0010 + mpu.x] = 0xFF mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.memory[0x0010 + mpu.x]) self.assertEquals(0x00, mpu.a) self.assertEquals(flags, mpu.flags) # STX Absolute def test_stx_absolute_stores_x_leaves_x_and_n_flag_unchanged(self): mpu = MPU() mpu.flags = flags = 0xFF & ~(mpu.NEGATIVE) mpu.x = 0xFF mpu.memory[0x0000:0x0002] = (0x8E, 0xCD, 0xAB) #=> STX $ABCD mpu.memory[0xABCD] = 0x00 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0xFF, mpu.memory[0xABCD]) self.assertEquals(0xFF, mpu.x) self.assertEquals(flags, mpu.flags) def test_stx_absolute_stores_x_leaves_x_and_z_flag_unchanged(self): mpu = MPU() mpu.flags = flags = 0xFF & ~(mpu.ZERO) mpu.x = 0x00 mpu.memory[0x0000:0x0002] = (0x8E, 0xCD, 0xAB) #=> STX $ABCD mpu.memory[0xABCD] = 0xFF mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x00, mpu.memory[0xABCD]) self.assertEquals(0x00, mpu.x) self.assertEquals(flags, mpu.flags) # STX Zero Page def test_stx_zp_stores_x_leaves_x_and_n_flag_unchanged(self): mpu = MPU() mpu.flags = flags = 0xFF & ~(mpu.NEGATIVE) mpu.x = 0xFF mpu.memory[0x0000:0x0001] = (0x86, 0x10) #=> STX $0010 mpu.memory[0x0010] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0xFF, mpu.memory[0x0010]) self.assertEquals(0xFF, mpu.x) self.assertEquals(flags, mpu.flags) def test_stx_zp_stores_x_leaves_x_and_z_flag_unchanged(self): mpu = MPU() mpu.flags = flags = 0xFF & ~(mpu.ZERO) mpu.x = 0x00 mpu.memory[0x0000:0x0001] = (0x86, 0x10) #=> STX $0010 mpu.memory[0x0010] = 0xFF mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.memory[0x0010]) self.assertEquals(0x00, mpu.x) self.assertEquals(flags, mpu.flags) # STX Zero Page, Y-Indexed def test_stx_zp_y_indexed_stores_x_leaves_x_and_n_flag_unchanged(self): mpu = MPU() mpu.flags = flags = 0xFF & ~(mpu.NEGATIVE) mpu.x = 0xFF mpu.y = 0x03 mpu.memory[0x0000:0x0001] = (0x96, 0x10) #=> STX $0010,Y mpu.memory[0x0010 + mpu.y] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0xFF, mpu.memory[0x0010 + mpu.y]) self.assertEquals(0xFF, mpu.x) self.assertEquals(flags, mpu.flags) def test_stx_zp_y_indexed_stores_x_leaves_x_and_z_flag_unchanged(self): mpu = MPU() mpu.flags = flags = 0xFF & ~(mpu.ZERO) mpu.x = 0x00 mpu.y = 0x03 mpu.memory[0x0000:0x0001] = (0x96, 0x10) #=> STX $0010,Y mpu.memory[0x0010 + mpu.y] = 0xFF mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.memory[0x0010 + mpu.y]) self.assertEquals(0x00, mpu.x) self.assertEquals(flags, mpu.flags) # STY Absolute def test_sty_absolute_stores_y_leaves_y_and_n_flag_unchanged(self): mpu = MPU() mpu.flags = flags = 0xFF & ~(mpu.NEGATIVE) mpu.y = 0xFF mpu.memory[0x0000:0x0002] = (0x8C, 0xCD, 0xAB) #=> STY $ABCD mpu.memory[0xABCD] = 0x00 mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0xFF, mpu.memory[0xABCD]) self.assertEquals(0xFF, mpu.y) self.assertEquals(flags, mpu.flags) def test_sty_absolute_stores_y_leaves_y_and_z_flag_unchanged(self): mpu = MPU() mpu.flags = flags = 0xFF & ~(mpu.ZERO) mpu.y = 0x00 mpu.memory[0x0000:0x0002] = (0x8C, 0xCD, 0xAB) #=> STY $ABCD mpu.memory[0xABCD] = 0xFF mpu.step() self.assertEquals(0x0003, mpu.pc) self.assertEquals(0x00, mpu.memory[0xABCD]) self.assertEquals(0x00, mpu.y) self.assertEquals(flags, mpu.flags) # STY Zero Page def test_sty_zp_stores_y_leaves_y_and_n_flag_unchanged(self): mpu = MPU() mpu.flags = flags = 0xFF & ~(mpu.NEGATIVE) mpu.y = 0xFF mpu.memory[0x0000:0x0001] = (0x84, 0x10) #=> STY $0010 mpu.memory[0x0010] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0xFF, mpu.memory[0x0010]) self.assertEquals(0xFF, mpu.y) self.assertEquals(flags, mpu.flags) def test_sty_zp_stores_y_leaves_y_and_z_flag_unchanged(self): mpu = MPU() mpu.flags = flags = 0xFF & ~(mpu.ZERO) mpu.y = 0x00 mpu.memory[0x0000:0x0001] = (0x84, 0x10) #=> STY $0010 mpu.memory[0x0010] = 0xFF mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.memory[0x0010]) self.assertEquals(0x00, mpu.y) self.assertEquals(flags, mpu.flags) # STY Zero Page, X-Indexed def test_sty_zp_x_indexed_stores_y_leaves_y_and_n_flag_unchanged(self): mpu = MPU() mpu.flags = flags = 0xFF & ~(mpu.NEGATIVE) mpu.y = 0xFF mpu.x = 0x03 mpu.memory[0x0000:0x0001] = (0x94, 0x10) #=> STY $0010,X mpu.memory[0x0010 + mpu.x] = 0x00 mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0xFF, mpu.memory[0x0010 + mpu.x]) self.assertEquals(0xFF, mpu.y) self.assertEquals(flags, mpu.flags) def test_sty_zp_x_indexed_stores_y_leaves_y_and_z_flag_unchanged(self): mpu = MPU() mpu.flags = flags = 0xFF & ~(mpu.ZERO) mpu.y = 0x00 mpu.x = 0x03 mpu.memory[0x0000:0x0001] = (0x94, 0x10) #=> STY $0010,X mpu.memory[0x0010 + mpu.x] = 0xFF mpu.step() self.assertEquals(0x0002, mpu.pc) self.assertEquals(0x00, mpu.memory[0x0010 + mpu.x]) self.assertEquals(0x00, mpu.y) self.assertEquals(flags, mpu.flags) # TAX def test_tax_transfers_accumulator_into_x(self): mpu = MPU() mpu.a = 0xAB mpu.x = 0x00 mpu.memory[0x0000] = 0xAA #=> TAX mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0xAB, mpu.a) self.assertEquals(0xAB, mpu.x) def test_tax_sets_negative_flag(self): mpu = MPU() mpu.flags &= ~(mpu.NEGATIVE) mpu.a = 0x80 mpu.x = 0x00 mpu.memory[0x0000] = 0xAA #=> TAX mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0x80, mpu.a) self.assertEquals(0x80, mpu.x) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) def test_tax_sets_zero_flag(self): mpu = MPU() mpu.flags &= ~(mpu.ZERO) mpu.a = 0x00 mpu.x = 0xFF mpu.memory[0x0000] = 0xAA #=> TAX mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(0x00, mpu.x) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) # TAY def test_tay_transfers_accumulator_into_y(self): mpu = MPU() mpu.a = 0xAB mpu.y = 0x00 mpu.memory[0x0000] = 0xA8 #=> TAY mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0xAB, mpu.a) self.assertEquals(0xAB, mpu.y) def test_tay_sets_negative_flag(self): mpu = MPU() mpu.flags &= ~(mpu.NEGATIVE) mpu.a = 0x80 mpu.y = 0x00 mpu.memory[0x0000] = 0xA8 #=> TAY mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0x80, mpu.a) self.assertEquals(0x80, mpu.y) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) def test_tay_sets_zero_flag(self): mpu = MPU() mpu.flags &= ~(mpu.ZERO) mpu.a = 0x00 mpu.y = 0xFF mpu.memory[0x0000] = 0xA8 #=> TAY mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(0x00, mpu.y) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) # TSX def test_tsx_transfers_stack_pointer_into_x(self): mpu = MPU() mpu.sp = 0xAB mpu.x = 0x00 mpu.memory[0x0000] = 0xBA #=> TSX mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0xAB, mpu.sp) self.assertEquals(0xAB, mpu.x) def test_tsx_sets_negative_flag(self): mpu = MPU() mpu.flags &= ~(mpu.NEGATIVE) mpu.sp = 0x80 mpu.x = 0x00 mpu.memory[0x0000] = 0xBA #=> TSX mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0x80, mpu.sp) self.assertEquals(0x80, mpu.x) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) def test_tsx_sets_zero_flag(self): mpu = MPU() mpu.flags &= ~(mpu.ZERO) mpu.sp = 0x00 mpu.y = 0xFF mpu.memory[0x0000] = 0xBA #=> TSX mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0x00, mpu.sp) self.assertEquals(0x00, mpu.x) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) # TXA def test_txa_transfers_x_into_a(self): mpu = MPU() mpu.x = 0xAB mpu.a = 0x00 mpu.memory[0x0000] = 0x8A #=> TXA mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0xAB, mpu.a) self.assertEquals(0xAB, mpu.x) def test_txa_sets_negative_flag(self): mpu = MPU() mpu.flags &= ~(mpu.NEGATIVE) mpu.x = 0x80 mpu.a = 0x00 mpu.memory[0x0000] = 0x8A #=> TXA mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0x80, mpu.a) self.assertEquals(0x80, mpu.x) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) def test_txa_sets_zero_flag(self): mpu = MPU() mpu.flags &= ~(mpu.ZERO) mpu.x = 0x00 mpu.a = 0xFF mpu.memory[0x0000] = 0x8A #=> TXA mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0x00, mpu.a) self.assertEquals(0x00, mpu.x) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) # TXS def test_txs_transfers_x_into_stack_pointer(self): mpu = MPU() mpu.x = 0xAB mpu.memory[0x0000] = 0x9A #=> TXS mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0xAB, mpu.sp) self.assertEquals(0xAB, mpu.x) def test_txs_does_not_set_negative_flag(self): mpu = MPU() mpu.flags &= ~(mpu.NEGATIVE) mpu.x = 0x80 mpu.memory[0x0000] = 0x9A #=> TXS mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0x80, mpu.sp) self.assertEquals(0x80, mpu.x) self.assertEquals(0, mpu.flags & mpu.NEGATIVE) def test_txs_does_not_set_zero_flag(self): mpu = MPU() mpu.flags &= ~(mpu.ZERO) mpu.x = 0x00 mpu.memory[0x0000] = 0x9A #=> TXS mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0x00, mpu.sp) self.assertEquals(0x00, mpu.x) self.assertEquals(0, mpu.flags & mpu.ZERO) # TYA def test_tya_transfers_y_into_a(self): mpu = MPU() mpu.y = 0xAB mpu.a = 0x00 mpu.memory[0x0000] = 0x98 #=> TYA mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0xAB, mpu.a) self.assertEquals(0xAB, mpu.y) def test_tya_sets_negative_flag(self): mpu = MPU() mpu.flags &= ~(mpu.NEGATIVE) mpu.y = 0x80 mpu.a = 0x00 mpu.memory[0x0000] = 0x98 #=> TYA mpu.step() self.assertEquals(0x0001, mpu.pc) self.assertEquals(0x80, mpu.a) self.assertEquals(0x80, mpu.y) self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE) def test_tya_sets_zero_flag(self): mpu = MPU() mpu.flags &= ~(mpu.ZERO) mpu.y = 0x00 mpu.a = 0xFF mpu.memory[0x0000] = 0x98 #=> TYA mpu.step() self.assertEquals(0x00, mpu.a) self.assertEquals(0x00, mpu.y) self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) self.assertEquals(0x0001, mpu.pc) def test_suite(): return unittest.findTestCases(sys.modules[__name__]) if __name__ == '__main__': unittest.main(defaultTest='test_suite')