• 1991

Software Description

NEC started shipping ACOS-4/XVP (eXtended multi Virtual Processor) in April 1991.  ACOS-4/XVP was an operating system (OS) that expansively integrated the previous models ACOS-4/AVP XR and ACOS-4/MVP XE and covered all ACOS systems (3400, 3500, 3600 and 3800), ranging from small/medium machines to super-large machines.
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    Operating Systems
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