code: def instruction_ROL_register(self, opcode, register):
          
          a = register.value
          r = self.ROL(a)
  #        log.debug("$%x ROL %s value $%x << 1 | Carry = $%x" % (
  #            self.program_counter,
  #            register.name, a, r
  #        ))
          register.set(r)
docs: Rotate accumulator left