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Add tests for page wrapping with indirect indexed (Y) on NMOS 6502
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Mike Naberezny
parent
28ff8d1d31
commit
806bed0a80
@ -5611,6 +5611,7 @@ class MPUTests(unittest.TestCase, Common6502Tests):
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def test_adc_ind_indexed_has_page_wrap_bug(self):
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mpu = self._make_mpu()
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mpu.p = 0x00
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mpu.a = 0x01
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mpu.x = 0xFF
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# $0000 ADC ($80,X)
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@ -5624,6 +5625,26 @@ class MPUTests(unittest.TestCase, Common6502Tests):
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mpu.step()
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self.assertEqual(0x03, mpu.a)
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# ADC Indexed, Indirect (Y)
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def test_adc_indexed_ind_y_has_page_wrap_bug(self):
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mpu = self._make_mpu()
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mpu.pc = 0x1000
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mpu.p = 0
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mpu.a = 0x42
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mpu.y = 0x02
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# $1000 ADC ($FF),Y
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self._write(mpu.memory, 0x1000, (0x71, 0xff))
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# Vector
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mpu.memory[0x00ff] = 0x10 # low byte
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mpu.memory[0x0100] = 0x20 # high byte if no page wrap
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mpu.memory[0x0000] = 0x00 # high byte if page wrapped
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# Data
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mpu.memory[0x2012] = 0x14 # read if no page wrap
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mpu.memory[0x0012] = 0x42 # read if page wrapped
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mpu.step()
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self.assertEqual(0x84, mpu.a)
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# AND Indirect, Indexed (X)
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def test_and_ind_indexed_x_has_page_wrap_bug(self):
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@ -5641,6 +5662,25 @@ class MPUTests(unittest.TestCase, Common6502Tests):
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mpu.step()
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self.assertEqual(0x42, mpu.a)
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# AND Indexed, Indirect (Y)
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def test_and_indexed_ind_y_has_page_wrap_bug(self):
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mpu = self._make_mpu()
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mpu.pc = 0x1000
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mpu.a = 0x42
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mpu.y = 0x02
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# $1000 AND ($FF),Y
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self._write(mpu.memory, 0x1000, (0x31, 0xff))
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# Vector
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mpu.memory[0x00ff] = 0x10 # low byte
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mpu.memory[0x0100] = 0x20 # high byte if no page wrap
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mpu.memory[0x0000] = 0x00 # high byte if page wrapped
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# Data
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mpu.memory[0x2012] = 0x00 # read if no page wrap
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mpu.memory[0x0012] = 0xFF # read if page wrapped
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mpu.step()
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self.assertEqual(0x42, mpu.a)
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# BRK
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def test_brk_preserves_decimal_flag_when_it_is_set(self):
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@ -5681,6 +5721,26 @@ class MPUTests(unittest.TestCase, Common6502Tests):
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mpu.step()
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self.assertEqual(mpu.ZERO, mpu.p & mpu.ZERO)
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# CMP Indexed, Indirect (Y)
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def test_cmp_indexed_ind_y_has_page_wrap_bug(self):
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mpu = self._make_mpu()
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mpu.pc = 0x1000
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mpu.p = 0
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mpu.a = 0x42
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mpu.y = 0x02
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# $1000 CMP ($FF),Y
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self._write(mpu.memory, 0x1000, (0xd1, 0xff))
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# Vector
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mpu.memory[0x00ff] = 0x10 # low byte
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mpu.memory[0x0100] = 0x20 # high byte if no page wrap
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mpu.memory[0x0000] = 0x00 # high byte if page wrapped
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# Data
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mpu.memory[0x2012] = 0x14 # read if no page wrap
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mpu.memory[0x0012] = 0x42 # read if page wrapped
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mpu.step()
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self.assertEqual(mpu.ZERO, mpu.p & mpu.ZERO)
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# EOR Indirect, Indexed (X)
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def test_eor_ind_x_has_page_wrap_bug(self):
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@ -5699,6 +5759,25 @@ class MPUTests(unittest.TestCase, Common6502Tests):
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mpu.step()
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self.assertEqual(0x55, mpu.a)
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# EOR Indexed, Indirect (Y)
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def test_eor_indexed_ind_y_has_page_wrap_bug(self):
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mpu = self._make_mpu()
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mpu.pc = 0x1000
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mpu.a = 0xAA
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mpu.y = 0x02
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# $1000 EOR ($FF),Y
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self._write(mpu.memory, 0x1000, (0x51, 0xff))
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# Vector
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mpu.memory[0x00ff] = 0x10 # low byte
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mpu.memory[0x0100] = 0x20 # high byte if no page wrap
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mpu.memory[0x0000] = 0x00 # high byte if page wrapped
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# Data
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mpu.memory[0x2012] = 0x00 # read if no page wrap
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mpu.memory[0x0012] = 0xFF # read if page wrapped
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mpu.step()
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self.assertEqual(0x55, mpu.a)
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# LDA Indirect, Indexed (X)
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def test_lda_ind_indexed_x_has_page_wrap_bug(self):
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@ -5716,6 +5795,25 @@ class MPUTests(unittest.TestCase, Common6502Tests):
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mpu.step()
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self.assertEqual(0xEF, mpu.a)
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# LDA Indexed, Indirect (Y)
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def test_lda_indexed_ind_y_has_page_wrap_bug(self):
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mpu = self._make_mpu()
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mpu.pc = 0x1000
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mpu.a = 0x00
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mpu.y = 0x02
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# $1000 LDA ($FF),Y
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self._write(mpu.memory, 0x1000, (0xb1, 0xff))
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# Vector
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mpu.memory[0x00ff] = 0x10 # low byte
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mpu.memory[0x0100] = 0x20 # high byte if no page wrap
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mpu.memory[0x0000] = 0x00 # high byte if page wrapped
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# Data
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mpu.memory[0x2012] = 0x14 # read if no page wrap
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mpu.memory[0x0012] = 0x42 # read if page wrapped
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mpu.step()
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self.assertEqual(0x42, mpu.a)
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# LDA Zero Page, X-Indexed
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def test_lda_zp_x_has_page_wrap_bug(self):
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@ -5757,6 +5855,25 @@ class MPUTests(unittest.TestCase, Common6502Tests):
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mpu.step()
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self.assertEqual(0x42, mpu.a)
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# ORA Indexed, Indirect (Y)
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def test_ora_indexed_ind_y_has_page_wrap_bug(self):
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mpu = self._make_mpu()
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mpu.pc = 0x1000
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mpu.a = 0x00
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mpu.y = 0x02
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# $1000 ORA ($FF),Y
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self._write(mpu.memory, 0x1000, (0x11, 0xff))
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# Vector
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mpu.memory[0x00ff] = 0x10 # low byte
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mpu.memory[0x0100] = 0x20 # high byte if no page wrap
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mpu.memory[0x0000] = 0x00 # high byte if page wrapped
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# Data
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mpu.memory[0x2012] = 0x00 # read if no page wrap
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mpu.memory[0x0012] = 0x42 # read if page wrapped
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mpu.step()
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self.assertEqual(0x42, mpu.a)
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# SBC Indirect, Indexed (X)
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def test_sbc_ind_x_has_page_wrap_bug(self):
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@ -5775,6 +5892,26 @@ class MPUTests(unittest.TestCase, Common6502Tests):
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mpu.step()
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self.assertEqual(0x01, mpu.a)
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# SBC Indexed, Indirect (Y)
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def test_sbc_indexed_ind_y_has_page_wrap_bug(self):
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mpu = self._make_mpu()
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mpu.pc = 0x1000
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mpu.p = mpu.CARRY
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mpu.a = 0x42
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mpu.y = 0x02
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# $1000 SBC ($FF),Y
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self._write(mpu.memory, 0x1000, (0xf1, 0xff))
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# Vector
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mpu.memory[0x00ff] = 0x10 # low byte
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mpu.memory[0x0100] = 0x20 # high byte if no page wrap
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mpu.memory[0x0000] = 0x00 # high byte if page wrapped
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# Data
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mpu.memory[0x2012] = 0x02 # read if no page wrap
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mpu.memory[0x0012] = 0x03 # read if page wrapped
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mpu.step()
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self.assertEqual(0x3f, mpu.a)
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# STA Indirect, Indexed (X)
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def test_sta_ind_indexed_x_has_page_wrap_bug(self):
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@ -5793,17 +5930,24 @@ class MPUTests(unittest.TestCase, Common6502Tests):
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self.assertEqual(0x00, mpu.memory[0xABCD])
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self.assertEqual(0x42, mpu.memory[0xBBBB])
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# Test page wrapping
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# STA Indexed, Indirect (Y)
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def test_zeropage_indexed_ind_wrap(self):
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def test_sta_indexed_ind_y_stores_a_leaves_a_and_n_flag_unchanged(self):
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mpu = self._make_mpu()
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mpu.y = 0
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mpu.memory[0xb100] = 0x31
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mpu.memory[0x00ff] = 0
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# $0000 LDA ($FF),Y
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self._write(mpu.memory, 0, (0xb1, 0xff))
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mpu.pc = 0x1000
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mpu.a = 0x42
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mpu.y = 0x02
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# $1000 STA ($FF),Y
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self._write(mpu.memory, 0x1000, (0x91, 0xff))
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# Vector
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mpu.memory[0x00ff] = 0x10 # low byte
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mpu.memory[0x0100] = 0x20 # high byte if no page wrap
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mpu.memory[0x0000] = 0x00 # high byte if page wrapped
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# Data
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mpu.memory[0x2012] = 0x00 # written if no page wrap
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mpu.memory[0x0012] = 0x00 # written if page wrapped
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mpu.step()
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self.assertEqual(0x31, mpu.a)
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self.assertEqual(0x42, mpu.memory[0x0012])
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def _get_target_class(self):
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return py65.devices.mpu6502.MPU
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