diff --git a/src/py65/tests/devices/test_mpu6502.py b/src/py65/tests/devices/test_mpu6502.py
index ae54519..67836c4 100644
--- a/src/py65/tests/devices/test_mpu6502.py
+++ b/src/py65/tests/devices/test_mpu6502.py
@@ -3744,66 +3744,6 @@ class Common6502Tests:
 
   # SBC Indirect, Indexed (X)
   
-  def test_sbc_ind_x_all_zeros_and_no_borrow_is_zero(self):
-    mpu = self._make_mpu()
-    mpu.flags &= ~(mpu.DECIMAL)
-    mpu.flags |= mpu.CARRY # borrow = 0
-    mpu.a = 0x00
-    self._write(mpu.memory, 0x0000, (0xE1, 0x10)) #=> SBC ($10,X)
-    self._write(mpu.memory, 0x0013, (0xED, 0xFE)) #=> Vector to $FEED
-    mpu.x = 0x03
-    mpu.memory[0xFEED] = 0x00
-    mpu.step()
-    self.assertEquals(0x00, mpu.a)
-    self.assertEquals(0, mpu.flags & mpu.NEGATIVE)
-    self.assertEquals(mpu.CARRY, mpu.CARRY)
-    self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO)
-  
-  def test_sbc_ind_x_downto_zero_no_borrow_sets_z_clears_n(self):
-    mpu = self._make_mpu()
-    mpu.flags &= ~(mpu.DECIMAL)
-    mpu.flags |= mpu.CARRY # borrow = 0
-    mpu.a = 0x01
-    self._write(mpu.memory, 0x0000, (0xE1, 0x10)) #=> SBC ($10,X)
-    self._write(mpu.memory, 0x0013, (0xED, 0xFE)) #=> Vector to $FEED
-    mpu.x = 0x03  
-    mpu.memory[0xFEED] = 0x01
-    mpu.step()
-    self.assertEquals(0x00, mpu.a)
-    self.assertEquals(0, mpu.flags & mpu.NEGATIVE)
-    self.assertEquals(mpu.CARRY, mpu.CARRY)
-    self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO)
-
-  def test_sbc_ind_x_downto_zero_with_borrow_sets_z_clears_n(self):
-    mpu = self._make_mpu()
-    mpu.flags &= ~(mpu.DECIMAL)
-    mpu.flags &= ~(mpu.CARRY) # borrow = 1
-    mpu.a = 0x01
-    self._write(mpu.memory, 0x0000, (0xE1, 0x10)) #=> SBC ($10,X)
-    self._write(mpu.memory, 0x0013, (0xED, 0xFE)) #=> Vector to $FEED
-    mpu.x = 0x03
-    mpu.memory[0xFEED] = 0x00
-    mpu.step()
-    self.assertEquals(0x00, mpu.a)
-    self.assertEquals(0, mpu.flags & mpu.NEGATIVE)
-    self.assertEquals(mpu.CARRY, mpu.CARRY)
-    self.assertEquals(mpu.ZERO, mpu.flags & mpu.ZERO)  
-  
-  def test_sbc_ind_x_downto_four_with_borrow_clears_z_n(self):
-    mpu = self._make_mpu()
-    mpu.flags &= ~(mpu.DECIMAL)
-    mpu.flags &= ~(mpu.CARRY) # borrow = 1
-    mpu.a = 0x07
-    self._write(mpu.memory, 0x0000, (0xE1, 0x10)) #=> SBC ($10,X)
-    self._write(mpu.memory, 0x0013, (0xED, 0xFE)) #=> Vector to $FEED
-    mpu.x = 0x03  
-    mpu.memory[0xFEED] = 0x02
-    mpu.step()
-    self.assertEquals(0x04, mpu.a)
-    self.assertEquals(0, mpu.flags & mpu.NEGATIVE)
-    self.assertEquals(0, mpu.flags & mpu.ZERO)  
-    self.assertEquals(mpu.CARRY, mpu.CARRY)
-
   def test_sbc_ind_x_all_zeros_and_no_borrow_is_zero(self):
     mpu = self._make_mpu()
     mpu.flags &= ~(mpu.DECIMAL)