These are all register-to-register machines. All models have one scalar and one vector unit which can execute computations independently. The scalar unit fetches all instructions and passes each instruction to the appropriate unit for execution. The scalar processor is based on the Fujitsu M380/382 series mainframes and runs the IBM S/370 extended architecture instruction set. A recent Amdahl proprietary software program product, called VP/XA, allows Amdahl vector processors to run current MVS/XA releases, and permits Amdahl supercomputers to use standard operating environments.
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