NEC ACOS-6/MVX

NEC announced ACOS-6/MVX (Multiple Virtual eXtended) in September 1984, and started shipping it in March 1985.
　ACOS-6/MVX was an operating system for large to ultra-large machines,and was designed to have high functionality, expandability and reliability while maintaining upper compatibility based on a concept consistent with the operating system ACOS-6, which was shipped earlier.Compared with ACOS6 it achieved a higher level of basic system control, such as support for large-scale, high-performance multiprocessor systems and support for virtual computer systems, and realized a basic software extension function that integrated a mainframe supporting integrated office automation with workstations. ACOS-6/MVX was installed in systems 650, 850 and 1000, which had previously operated with ACOS-6, as an upper compatible OS, as well as in systems 830, 930 and 2000, which were newly shipped.