6502/py65
1
0
Fork 0
mirror of https://github.com/mnaberez/py65.git synced 2025-03-06 17:29:43 +00:00
Code Issues Projects Releases Wiki Activity

Added test for 65C02 instruction BIT Absolute,X.

Browse Source
This commit is contained in:
Mike Naberezny 2009-04-24 23:15:08 -07:00
parent b792eec839
commit 3afbf801d7
1 changed files with 94 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

96
src/py65/tests/devices/test_mpu65c02.py
View File

@ -112,8 +112,100 @@ class MPUTests(unittest.TestCase, Common6502Tests):
self.assertEquals(0xAA, mpu.a)
self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE)
self.assertEquals(0, mpu.flags & mpu.ZERO)
# BIT (Zero Page)
# BIT (Absolute, X-Indexed)
def test_bit_abs_x_copies_bit_7_of_memory_to_n_flag_when_0(self):
mpu = self._make_mpu()
mpu.flags &= ~(mpu.NEGATIVE)
mpu.x = 0x02
self._write(mpu.memory, 0x0000, (0x3C, 0xEB, 0xFE)) #=> BIT $FEEB,X
mpu.memory[0xFEED] = 0xFF
mpu.a = 0xFF
mpu.step()
self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE)
self.assertEquals(4, mpu.processorCycles)
self.assertEquals(0x0003, mpu.pc)
def test_bit_abs_x_copies_bit_7_of_memory_to_n_flag_when_1(self):
mpu = self._make_mpu()
mpu.flags &= mpu.NEGATIVE
mpu.x = 0x02
self._write(mpu.memory, 0x0000, (0x3C, 0xEB, 0xFE)) #=> BIT $FEEB,X
mpu.memory[0xFEED] = 0x00
mpu.a = 0xFF
mpu.step()
self.assertEquals(0, mpu.flags & mpu.NEGATIVE)
self.assertEquals(4, mpu.processorCycles)
self.assertEquals(0x0003, mpu.pc)
def test_bit_abs_x_copies_bit_6_of_memory_to_v_flag_when_0(self):
mpu = self._make_mpu()
mpu.flags &= ~(mpu.OVERFLOW)
mpu.x = 0x02
self._write(mpu.memory, 0x0000, (0x3C, 0xEB, 0xFE)) #=> BIT $FEEB,X
mpu.memory[0xFEED] = 0xFF
mpu.a = 0xFF
mpu.step()
self.assertEquals(mpu.OVERFLOW, mpu.flags & mpu.OVERFLOW)
self.assertEquals(4, mpu.processorCycles)
self.assertEquals(0x0003, mpu.pc)
def test_bit_abs_x_copies_bit_6_of_memory_to_v_flag_when_1(self):
mpu = self._make_mpu()
mpu.flags &= mpu.OVERFLOW
mpu.x = 0x02
self._write(mpu.memory, 0x0000, (0x3C, 0xEB, 0xFE)) #=> BIT $FEEB,X
mpu.memory[0xFEED] = 0x00
mpu.a = 0xFF
mpu.step()
self.assertEquals(0, mpu.flags & mpu.OVERFLOW)
self.assertEquals(4, mpu.processorCycles)
self.assertEquals(0x0003, mpu.pc)
def test_bit_abs_x_stores_result_of_and_in_z_while_preserving_a_when_1(self):
mpu = self._make_mpu()
mpu.flags &= mpu.ZERO
mpu.x = 0x02
self._write(mpu.memory, 0x0000, (0x3C, 0xEB, 0xFE)) #=> BIT $FEEB,X
mpu.memory[0xFEED] = 0x00
mpu.a = 0x01
mpu.step()
self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO)
self.assertEquals(0x01, mpu.a)
self.assertEquals(0x00, mpu.memory[0xFEED])
self.assertEquals(4, mpu.processorCycles)
self.assertEquals(0x0003, mpu.pc)
def test_bit_abs_x_stores_result_of_and_when_nonzero_in_z_while_preserving_a(self):
mpu = self._make_mpu()
mpu.flags &= mpu.ZERO
mpu.x = 0x02
self._write(mpu.memory, 0x0000, (0x3C, 0xEB, 0xFE)) #=> BIT $FEEB,X
mpu.memory[0xFEED] = 0x01
mpu.a = 0x01
mpu.step()
self.assertEquals(0, mpu.flags & mpu.ZERO) # result of AND is non-zero
self.assertEquals(0x01, mpu.a)
self.assertEquals(0x01, mpu.memory[0xFEED])
self.assertEquals(4, mpu.processorCycles)
self.assertEquals(0x0003, mpu.pc)
def test_bit_abs_x_stores_result_of_and_when_zero_in_z_while_preserving_a(self):
mpu = self._make_mpu()
mpu.flags &= ~(mpu.ZERO)
mpu.x = 0x02
self._write(mpu.memory, 0x0000, (0x3C, 0xEB, 0xFE)) #=> BIT $FEEB,X
mpu.memory[0xFEED] = 0x00
mpu.a = 0x01
mpu.step()
self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO) # result of AND is zero
self.assertEquals(0x01, mpu.a)
self.assertEquals(0x00, mpu.memory[0xFEED])
self.assertEquals(4, mpu.processorCycles)
self.assertEquals(0x0003, mpu.pc)
# BIT (Zero Page, X-Indexed)
def test_bit_zp_x_copies_bit_7_of_memory_to_n_flag_when_0(self):
mpu = self._make_mpu()