Before revision: The design of a von Neumann architecture machine is simpler than in a Harvard architecture machine—which is also a stored-program system, yet has one dedicated set of address and data buses for reading and writing to memory , and another set of address and data buses to fetch instructions .
After revision: The design of a von Neumann architecture machine is simpler than the Harvard architecture (which has one dedicated set of address and data buses for reading and writing to memory ) and another set of address and data buses to fetch instructions .