Elxsi

Elxsi was a minicomputer manufacturing company established in the late 1970s in Silicon Valley, USA, along with a host of competitors (Trilogy Systems, Sequent, Convex Computer). The Elxsi processor was an Emitter Coupled Logic (ECL) design that featured a 50-nanosecond clock, a 25-nanosecond back panel bus, IEEE floating-point arithmetic and a 64-bit architecture. It allowed multiple processors to communicate over a common bus called the Gigabus, believed to be the first company to do so. The operating system was a message-based operating system called EMBOS. The Elxsi CPU was a microcoded design, allowing custom instructions to be coded into microcode.
History.
Elxsi was founded in 1979 by Joe Rizzi (previously a manager at Intersil) and Thampy Thomas (who would go on to found NexGen Microsystems). It is believed that Elxsi was the first startup founded by an Indian in Silicon Valley. Much of the architecture of the Elxsi machine was designed by former Stanford University professors Len Shar and Balasubrimanian Kumar. Another key contributor to the design was Harold (Mac) McFarland, who was also a key designer on the team that created the PDP-11. George Taylor (on the IEEE standard committee and a student of UC Berkeley Professor William Kahan) provided a key design for the IEEE floating-point unit.
Elxsi was bought out by Gene Amdahl in 1985 with money that was leftover from the Trilogy venture. Venture investors in Elxsi included Tata Group (India) and Arthur Rock. In 1989, however, Elxsi left the computer business because of the general shift away from the use of mainframes in the global computer industry and the advent of the personal computer. The Tata Group kept the name Tata Elxsi but it now belongs to the Tata group of companies.
The original Elxsi Corporation, however, remained in business as a going concern. In 1989, the company sold its computer maintenance business to National Computer Systems. In 1991, the company entered two entirely different lines of business: restaurants and sewer inspection equipment. ELXSI is still engaged in these businesses, as well as its CUES unit, which makes video pipeline inspection equipment.
Before its withdrawal from the computer industry, the large range of hardware expansion gave the machine some success in departmental technical computing environments. The 64-bit registers and ability to do parallel adds within them gave it an unanticipated advantage in COBOL benchmarks, where it outperformed some mainframes. And the extreme independence of the CPUs (lack of cache snooping and invalidation), coupled with the ability to lock processes into register sets and later, the ability to partition the caches, gave it some success in real-time applications.
Hardware.
The machine was a mini-supercomputer: a category of computers that was larger than a VAX 11/780 and smaller than a mainframe. This market segment disappeared as high-end microprocessor-based systems became more powerful.
The architecture was unusual, especially for its day. The system bus connected as many as 12 CPUs and I/O processors. Each CPU was built from three large boards of ECL gate arrays. Key elements of its instruction set architecture were:
Software.
The EMBOS OS was written entirely from scratch in a slightly extended Pascal. It was a multi-server architecture (like GNU Hurd, but long predating that project). The UI was Unix-like, especially at the shell level, with similar concepts but different commands, syntax, etc. (e.g. "files" instead of "ls"; "find" instead of "grep"). Later, a Unix kernel was hosted on top of the lower-level servers so that EMBOS and Unix processes and users could co-exist (ENIX). VMS compatibility software running on top of EMBOS was also added to ease porting of VAX applications.
Famous employees.
Although Elxsi was not a financial success, many of its employees did go on to fame and fortune.