System/390 is a series of IBM mainframe models. Successor to the System/370s, and more specifically the System 370/ESAs[?]. Rebranded as zSeries.
... 595 housing units at an average density of 1,640.9/km² (4,169.6/mi²). The racial makeup of the village is 98.55% White, 0.00% African American, 0.00% Nativ ...