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The Cray XMS was a vector processor minisupercomputer sold by Cray Research from 1990 to 1991. The XMS was originally designed by Supertek Computers Inc. as the Supertek S-1, intended to be a low-cost air-cooled clone of the Cray X-MP with a CMOS re-implementation of the X-MP processor architecture, and a VMEbus-based Input/Output Subsystem (IOS). The XMS could run Cray's UNICOS operating system. Supertek were acquired by Cray Research in 1990, and the S-1 was rebadged XMS by Cray. Its processor had a 55 ns clock period (18.2 MHz clock frequency) and 16 megawords (128 MB) of memory.
The XMS was a short-lived model, and was superseded by the Cray Y-MP EL, which was under development by Supertek (as the Supertek S-2) at the time of the Cray acquisition.
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