 Originally supposed to ship in June or July 1991, it was delayed until September 1991, with the reason given by DEC being that it wanted to tune a new release of VMS for the system.The Model 610 was architecturally identical to the Model 410, except that the two zones were packaged vertically a 60" high cabinet, with Zone A above Zone B.The cabinet had more storage capacity than the systems packaged in pedestals, and for this reason the Model 610 was intended for data centers.