Cray J90

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Cray J916

The Cray J90 series (code-named

RTOS. The IOS was programmed to emulate the IOS Model E, used in the larger Cray Y-MP
systems, in order to minimize changes in the UNICOS operating system. By using standard VME boards, a wide variety of commodity peripherals could be used.

The J90 was available in three basic configurations, the J98 with up to eight processors, the J916 with up to 16 processors, and the J932 with up to 32 processors.

Each J90 processor was composed of two chips - one for the scalar portion of the processor, and the other for the vector portion. The scalar chip was also notable for including a small (128 word)

data cache
to enhance scalar performance. (Cray machines have always had instruction caching.)

In 1997 the J90se (Scalar Enhanced) series became available, which doubled the scalar speed of the processors to 200 MHz; the vector chip remained at 100 MHz. Support was also added for the GigaRing I/O system found on the Cray T3E and Cray SV1, replacing IOS-V. Later, SV1 processors could be installed in a J90 or J90se, further increasing performance within the same frame.

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