code: def __set_byte(self, byte, lineno):
          
          if byte < 0 or byte > 255:
              error(lineno, 'Invalid byte value %i' % byte)
  
          self.memory_bytes[self.org] = byte
          self.index += 1
docs: Sets a byte at the current location,
          and increments org in one. Raises an error if org > MAX_MEMORY