Source : Free On-Line Dictionary of Computing

Sun-4 Workstation
     
         A {Unix} {workstation} 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)