Discuss the similarities and differences between an MISD and SIMD machine. Answer this question in terms of data-level parallelism.

A systolic array is an example of an MISD machine. A systolic array is a pipeline network or "wavefront" of data processing elements. Each of these elements does not need a program counter since execution is triggered by the arrival of data.
Clocked systolic arrays compute in "lock-step" with each processor undertaking alternate compute and communication phases.