Cray XMS

The Cray XMS was a minisupercomputer built around a vector processor and sold by Cray Research from 1990 to 1991. It began as the Supertek S-1, a design by Supertek Computers that aimed to be a low-cost, air-cooled clone of the Cray X-MP, with the X-MP processor architecture reimplemented in CMOS and an input and output subsystem based on the VMEbus. Cray Research acquired Supertek in 1990 and rebadged the S-1 as the XMS. The machine ran Cray's UNICOS operating system, had a clock period of 55 nanoseconds, which is about 18.2 megahertz, and held 16 megawords (128 megabytes) of memory. It was the first Cray Research system to support removable disk drives. The XMS was short lived and was superseded by the Cray Y-MP EL, which Supertek was already developing as the S-2.