The Xerox Sigma 9, also known as the XDS Sigma 9, was a high-speed, general purpose computer.
Developer | Xerox |
---|---|
Product family | Xerox Sigma |
Release date | 1970 |
Xerox first became interested in office automation through computers in 1969 and purchased Scientific Data Systems or SDS. They then renamed the division Xerox Data Systems or XDS; they saw limited success, and the division was ultimately sold to Honeywell at a significant loss.[1]
The Sigma 9 was announced in 1970 and the first delivery was made in 1971.[2] There were 3 models built, the Sigma 9, the Sigma 9 Model 2 and the Sigma 9 Model 3. The original was the most powerful and was universally applicable to all data processing applications at the time. The Model 2 was able to process in multi-programmed batch, remote batch, conversational time-sharing, real-time, and transaction processing modes. The Model 3 was designed for the scientific real-time community.
All models featured a CPU with at least a floating-point arithmetic unit, Memory map with access protection, Memory write protection, Two real-time clocks, a Power fail-safe, an External interface, Ten internal interrupt levels. Also a Multiplexor input/output processor (MIOP) featuring Channel A with eight sub-channels.[3]
Listed below are the individual specifications