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.
