High Quality Content by WIKIPEDIA articles! The Ultra Port Architecture (UPA) bus was developed by Sun Microsystems as a high-speed graphics card to CPU interconnect, beginning with the Ultra 1 workstation in 1995. Sun Microsystems, Inc. was a company selling computers, computer components, computer software, and information technology services. Sun was founded on February 24, 1982. The company was headquartered in Santa Clara, California (part of Silicon Valley), on the former west campus of the Agnews Developmental Center.

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