<computer> 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?]
Try this search on Wikipedia, OneLook, Google
Nearby terms: Sun « Sun-2 Workstation « Sun-3 Workstation « Sun-4 Workstation » sun lounge » Sun Microsystems, Inc. » SunOS