Writes a value into a memory region on the QAM at a specified offset.

        :param region_name: Name of the declared memory region on the QAM.
        :param offset: Integer offset into the memory region to write to.
        :param value: Value to store at the indicated location.

def write_memory(self, *, region_name: str, offset: int = 0, value=None):
        """
        Writes a value into a memory region on the QAM at a specified offset.

        :param region_name: Name of the declared memory region on the QAM.
        :param offset: Integer offset into the memory region to write to.
        :param value: Value to store at the indicated location.
        """
        assert self.status in ['loaded', 'done']

        aref = ParameterAref(name=region_name, index=offset)
        self._variables_shim[aref] = value

        return self