code: def rlc(self, r):
          
          if not is_number(self.regs[r]):
              self.set(r, None)
              self.set_flag(None)
              return
  
          v_ = self.getv(self.regs[r]) & 0xFF
          self.set(r, ((v_ << 1) & 0xFF) | (v_ >> 7))
docs: Does a ROTATION to the LEFT <<|