The differences between Neumann’s and Harvard’s architecture are:
Von Neumann architecture
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Design of the Von Neumann machine
The von Neumann architecture is a computer design model that uses a single storage structure to hold both instructions and data. The term describes such a computer, which implements a Universal Turing machine, and the common “referential model” of specifying sequential architectures, in contrast with parallel architectures.
is a computer architecture with physically separate storage and signal pathways for instructions and data. The term originated from the Harvard Mark I relay-based computer, which stored instructions on punched tape (24 bits wide) and data in electro-mechanical counters (23 digits wide). These early machines had limited data storage, entirely contained within the data processing unit, and provided no access to the instruction storage as data, making loading and modifying programs an entirely offline process.