Complex sentence: A special version of MVT was needed for the multi-process (dual CPU) Model, called MP65; it used special CPU-to-CPU/Multisystem mode instructions, such as Write Direct.
Split into simpler sentences: A special version of MVT, called MP65, is needed for the multi-process (dual CPU) Model. MP65 uses special CPU-to-CPU/Multisystem mode instructions, such as Write Direct.