{\bf CRAY Extended Architecture
}


\noindent
{\bf
Vector Register, Parallel, Shared-Memory Architecture
}

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\noindent
{\bf Architecture:}
This is a broad product family, ranging from single-processor
to two and four processor systems to the 8-processor Y-MP system.
The EA series systems feature large central memories (4 million
to 64 million 64-bit words).
Many of the models are upgradable with regard to the number of CPUs and
memory size.
CRAY X-MP EA/4 computer systems offer up to ten times greater performance than
the original CRAY-1 computer.

\vspace{.1in}
\noindent
Highlights:

\noindent
\begin{flushleft}
One-processor with 4 or 16 million words of MOS memory on the X-MP EQ/14se\\
  and X-MP EA/116se systems\\
One, two, or four processors sharing 16, 32, or 64 millions words of MOS memory\\
8.5 nsec clock cycle on X-MP EA systems\\
100 nsec clock cycle on X-MP EA/14se and X-MP EA/116se systems\\
SECDED memory protectin\\
four parallel memory ports per processor\\
flexible hardware chaining for vector operations\\
gather/scatter and compressed index vector support\\
flexible processor clustering for multitasking applications\\
dedicated registers for efficient interprocessor communications and control\\
X-mode and Y-mode instruction\\
\end{flushleft}

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\noindent
{\bf Configuration:}
Several hardware interfaces are available to integrate Cray systems into
customer environments:
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\noindent
Linkage to workstations through Network Systems Corporation or similar adapters.
Front-end system communication with IBM, CDC, DEC, Honeywell, Data General and
UNISYS computer systems.
IOS optionally configured with a 32-million-word or 128-million-word SSD in the same cabinet.
The machine is liquid cooled using inert fluorocarbon.
  

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\noindent
\begin{tabbing}
aaa\= \kill
{\bf Software:}\\
\vspace{.1in}
\>  UNIX-based OS (called UNICOS), based on AT\&T UNIX System V\\
\>  Cray operating system COS\\
\>  vectorizing Fortran compiler\\
\>  vectorizing C compiler\\
\>  optimized (Fortran mathematical and I/O subroutine library)\\
\>  vectorizing ISO Level 1 Pascal compiler\\
\>  CAL, the Cray macro assembler\\
\>  multitasking library\\
\>  scientific subroutine library optimized for EA systems\\
\>  wide variety of major applications programs\\
\end{tabbing}


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\noindent
{\bf Fortran characteristics:}
ANSI standard compliance; automatic optimization, including vectorizing of DO loops; portability of applications codes; library routines optimized for the EA systems

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\noindent
{\bf Applications:}
Advanced graphics; applied math; AI; atmospheric and oceanic research; circuit simulation and design; crashworhtiness simulation; economic modeling; energy research;
financial modeling; fluid dynamics; genetics engineering; molecular dynamics;
weather forecasting; signal and image processing.

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\noindent
{\bf Contact:}
\begin{flushleft}
Cray Research Inc.\\
1440 Northland Drive\\
Mendota Heights, MN 55120\\
612-452-6650\\
\vspace{.25in}
Michael Lindseth\\
Cray Research (UK) Ltd\\
Cray House\\
London Road\\
Bracknell\\
Berkshire RG12 2SY\\
England\\
0344-485971     Telex  848841
\end{flushleft}

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