What are the advantages of the Harvard architecture in relation to the von Neumann architecture? If you equip a von Neumann machine with a dual-ported RAM (that is a RAM which allows two concurrent...

What are the advantages of the Harvard architecture in relation to the von Neumann architecture? If you equip a von Neumann machine with a dual-ported RAM (that is a RAM which allows two concurrent accesses), does this make it a Harvard machine, or is there still something missing?