Step 1: Understanding Flynn’s classification.
Flynn’s taxonomy classifies computers based on the number of instruction streams and data streams.
Step 2: Characteristics of Von Neumann architecture.
Von Neumann computers execute a single instruction at a time on a single data item using a single processor.
Step 3: Matching with Flynn’s classes.
Single Instruction stream and Single Data stream corresponds to SISD.
Step 4: Final conclusion.
Therefore, Von Neumann computers are classified as SISD systems.