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)