Yes. I think we had a thread about it.
"That’s exactly what was found at Caral! Methinks they were quipu - not ‘offerings’ but hidden for safekeeping."
Their books/records?
and their history!
http://agutie.homestead.com/files/Quipu_B.htm
In the absence of written records the quipus served as a means of recording history and passed on to the next generation, which used them as reminders of stories. An thus these primitive computers - quipus - had knotted in their memory banks the information which tied together the Inca empire.