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Added 65C02 instruction ADC (ZP).

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Mike Naberezny 2009-04-08 18:58:05 -07:00
parent 5cb179450d
commit e61b29dbcd
2 changed files with 78 additions and 0 deletions
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5
src/py65/devices/mpu65c02.py
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@ -68,6 +68,11 @@ class MPU(NMOS6502):
self.opSTZ(self.ZeroPageAddr)
self.pc += 1
@instruction(name="ADC", mode="zpi", cycles=5)
def i72(self):
self.opADC(self.ZeroPageIndirectAddr)
self.pc += 1
@instruction(name="STZ", mode="zpx", cycles=4)
def i74(self):
self.opSTZ(self.ZeroPageXAddr)

73
src/py65/tests/devices/test_mpu65c02.py
View File

@ -12,6 +12,79 @@ class MPUTests(unittest.TestCase, Common6502Tests):
self.assertEquals('<65C02: A=00, X=00, Y=00, Flags=20, SP=ff, PC=0000>',
repr(mpu))
# ADC Zero Page, Indirect
def test_adc_bcd_off_zp_indirect_carry_clear_in_accumulator_zeroes(self):
mpu = self._make_mpu()
mpu.a = 0x00
self._write(mpu.memory, 0x0000, (0x72, 0x10)) #=> $0000 ADC ($0010)
self._write(mpu.memory, 0x0010, (0xCD, 0xAB)) #=> Vector to $ABCD
mpu.memory[0xABCD] = 0x00
mpu.step()
self.assertEquals(0x0002, mpu.pc)
self.assertEquals(5, mpu.processorCycles)
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_indirect_carry_set_in_accumulator_zero(self):
mpu = self._make_mpu()
mpu.a = 0
mpu.flags |= mpu.CARRY
self._write(mpu.memory, 0x0000, (0x72, 0x10)) #=> $0000 ADC ($0010)
self._write(mpu.memory, 0x0010, (0xCD, 0xAB)) #=> Vector to $ABCD
mpu.memory[0xABCD] = 0x00
mpu.step()
self.assertEquals(0x0002, mpu.pc)
self.assertEquals(5, mpu.processorCycles)
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_indirect_carry_clear_in_no_carry_clear_out(self):
mpu = self._make_mpu()
mpu.a = 0x01
self._write(mpu.memory, 0x0000, (0x72, 0x10)) #=> $0000 ADC ($0010)
self._write(mpu.memory, 0x0010, (0xCD, 0xAB)) #=> Vector to $ABCD
mpu.memory[0xABCD] = 0xFE
mpu.step()
self.assertEquals(0x0002, mpu.pc)
self.assertEquals(5, mpu.processorCycles)
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_indirect_carry_clear_in_carry_set_out(self):
mpu = self._make_mpu()
mpu.a = 0x02
self._write(mpu.memory, 0x0000, (0x72, 0x10)) #=> $0000 ADC ($0010)
self._write(mpu.memory, 0x0010, (0xCD, 0xAB)) #=> Vector to $ABCD
mpu.memory[0xABCD] = 0xFF
mpu.step()
self.assertEquals(0x0002, mpu.pc)
self.assertEquals(5, mpu.processorCycles)
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_indirect_overflow(self):
mpu = self._make_mpu()
mpu.a = 0xFF
self._write(mpu.memory, 0x0000, (0x72, 0x10)) #=> $0000 ADC ($0010)
self._write(mpu.memory, 0x0010, (0xCD, 0xAB)) #=> Vector to $ABCD
mpu.memory[0xABCD] = 0xFF
mpu.step()
self.assertEquals(0x0002, mpu.pc)
self.assertEquals(5, mpu.processorCycles)
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 Zero Page, Indirect
def test_and_zp_indirect_all_zeros_setting_zero_flag(self):