6502/py65
1
0
Fork 0
mirror of https://github.com/mnaberez/py65.git synced 2025-01-21 06:30:15 +00:00
Code Issues Projects Releases Wiki Activity
py65/mpu_test.py
Mike Naberezny 5a1de3a6c4 Fixed bugs in INC, added unit tests.
2008-08-10 03:17:35 +00:00

3793 lines
122 KiB
Python
Raw Blame History

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)
# 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)
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)
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)
# 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)
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)
# 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')
Reference in New Issue View Git Blame Copy Permalink