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Added 65C02 instruction EOR (ZP).

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This commit is contained in:
Mike Naberezny 2009-04-08 18:42:16 -07:00
parent 766609b9a4
commit 5cb179450d
2 changed files with 33 additions and 0 deletions
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5
src/py65/devices/mpu65c02.py
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@ -54,6 +54,11 @@ class MPU(NMOS6502):
self.opAND(self.ZeroPageIndirectAddr)
self.pc += 1
@instruction(name="EOR", mode="zpi", cycles=5)
def i52(self):
self.opEOR(self.ZeroPageIndirectAddr)
self.pc += 1
@instruction(name="PHY", mode="imp", cycles=3)
def i5a(self):
self.stPush(self.y)

28
src/py65/tests/devices/test_mpu65c02.py
View File

@ -40,6 +40,34 @@ class MPUTests(unittest.TestCase, Common6502Tests):
self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE)
self.assertEquals(0, mpu.flags & mpu.ZERO)
# EOR Zero Page, Indirect
def test_eor_zp_indirect_flips_bits_over_setting_z_flag(self):
mpu = self._make_mpu()
mpu.a = 0xFF
self._write(mpu.memory, 0x0000, (0x52, 0x10)) #=> EOR ($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(0x00, mpu.a)
self.assertEquals(0xFF, mpu.memory[0xABCD])
self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO)
def test_eor_zp_indirect_flips_bits_over_setting_n_flag(self):
mpu = self._make_mpu()
mpu.a = 0x00
self._write(mpu.memory, 0x0000, (0x52, 0x10)) #=> EOR ($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(0xFF, mpu.a)
self.assertEquals(0xFF, mpu.memory[0xABCD])
self.assertEquals(mpu.NEGATIVE, mpu.flags & mpu.NEGATIVE)
self.assertEquals(0, mpu.flags & mpu.ZERO)
# LDA Zero Page, Indirect