sentences:  The true distinction of a Harvard machine is that instruction and data memory occupy different address spaces.In other words, a memory address does not uniquely identify a storage location (as it does in a von Neumann machine); it is also necessary to know the memory space (instruction or data) to which the address belongs.A computer with a von Neumann architecture has the advantage over "pure" Harvard machines in that code can also be accessed and treated the same as data, and vice versa.