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a series of [[SPARC]] based [[Unix]] [https://en.wikipedia.org/wiki/Workstation workstations] and servers by [[Sun Microsystems]], evolving from the [[Sun#4|Sun-4]] line in the late 80s to compete with high-end [[IBM PC|PCs]] or [[Macintosh|Macs]].The '''SPARCstation 1''', first sold in April 1989. It featured several distinctive design elements driven by [[Mathematician#ABechtolsheim|Andy Bechtolsheim]], such as the paper sheet sized [https://en.wikipedia.org/wiki/Motherboard motherboard] with [https://en.wikipedia.org/wiki/SBus SBus] [https://en.wikipedia.org/wiki/Expansion_card expansion cards], allowing a compact footprint of the machine <ref>[https://en.wikipedia.org/wiki/SPARCstation_1 SPARCstation 1 from Wikipedia]</ref>.Subsequent models introduced multiple processors connected by the [https://en.wikipedia.org/wiki/MBus_(SPARC) MBus].The [https://en.wikipedia.org/wiki/SPARCstation_20 SPARCstation 20] as last model of the series was superseded by the [https://en.wikipedia.org/wiki/Sun_Ultra_series UltraSPARC] design in 1995