A UnixwORkstation produced by {Sun Microsystems, Inc.} in the late 1980s[?], based on {SPARC} processORs. The Sun-4 followed the Sun-3 WORkstation. Later SPARC-based wORkstations were called "SPARCstations". [Details? Dates? Was "Sun-4" a SPARCstation?] (2001-03-11)