Living Computers’ Sigma 9 was once used by a Tempe, Arizona-based medical billing business. One of the business’ partners moonlighted as a technical support engineer for Sigma systems and maintained a large inventory of spare parts and peripherals. He continued to maintain two of the systems (this Sigma 9, and a Sigma 6) even after the medical billing business moved onto personal computers around 2001. On his passing, the entire inventory—totaling more than 100,000 pounds of XDS computer equipment—was transferred to LCM+L and is now one of several systems available for remote online access.
 
Xerox was one of the most successful companies of the 1960s, pioneering the world’s first plain-paper office photocopier in 1959. But many often forget that in 1969, Xerox purchased Scientific Data Systems (SDS), a small but successful firm to become the nucleus of their new computer division. The purchase spurred Xerox to establish the Palo Alto Research Center (PARC), which soon became one of the most important computer science research centers in the world. However, Xerox Data Systems saw limited success and was ultimately sold to Honeywell in 1975 at a significant loss. One of the remaining relics of this era is the Xerox Sigma 9, sister to the SDS Sigma 7 which performed the first operation on the ARPANET—the precursor of today's Internet—by attempting to log in to a Scientific Data Systems 940 at the Stanford Research Institute.