def opADC(self, x):
data = self.ByteAt(x())
if self.p & self.DECIMAL:
if self.p & self.CARRY:
tmp = 1
else:
tmp = 0
data = convert_to_bin(data) + convert_to_bin(self.a) + tmp
self.p &= ~(self.CARRY+self.OVERFLOW+self.NEGATIVE+self.ZERO)
if data > 99:
self.p |= self.CARRY + self.OVERFLOW
data -= 100
if data == 0:
self.p |= self.ZERO
else:
self.p |= data & 128
self.a = convert_to_bcd(data)
else:
if self.p & self.CARRY:
tmp = 1
else:
tmp = 0
result = data + self.a + tmp
self.p &= ~(self.CARRY+self.OVERFLOW+self.NEGATIVE+self.ZERO)
if ( ~(self.a ^ data) & (self.a ^ result) ) & 0x80:
self.p |= self.OVERFLOW
data = result
if data > 255:
self.p |= self.CARRY
data &=255
if data == 0:
self.p |= self.ZERO
else:
self.p |= data & 128
self.a = data
def opSBC(self, x):
data = self.ByteAt(x())
if self.p & self.DECIMAL:
if self.p & self.CARRY:
borrow = 0
else:
borrow = 1
data = convert_to_bin(self.a) - convert_to_bin(data) - borrow
self.p &= ~(self.CARRY + self.ZERO + self.NEGATIVE + self.OVERFLOW)
if data == 0:
self.p |= self.ZERO + self.CARRY
elif data > 0:
self.p |= self.CARRY
else:
self.p |= self.NEGATIVE
data +=100
self.a = convert_to_bcd(data)
else:
if self.p & self.CARRY:
borrow = 0
else:
borrow = 1
result = self.a + (~data & 0xFF) + (self.p & self.CARRY)
self.p &= ~(self.CARRY + self.ZERO + self.OVERFLOW + self.NEGATIVE)
if ( (self.a ^ data) & (self.a ^ result) ) & 0x80:
self.p |= self.OVERFLOW
data = result & 0xFF
if data == 0:
self.p |= self.ZERO
if result & 0x100:
self.p |= self.CARRY
self.p |= data & self.NEGATIVE
self.a = data
def test_convert_to_bin(self):
self.assertEqual(0, convert_to_bin(0))
self.assertEqual(99, convert_to_bin(0x99))
def test_convert_to_bin(self):
self.assertEqual(0, convert_to_bin(0))
self.assertEqual(99, convert_to_bin(0x99))
