\noindent
{\bf
SCS-30/XM and SCS-40/XM
}


\vspace{.1in}
\noindent
The company is no longer marketing this product.

\vspace{.1in}
\noindent
{\bf
Vector Register Architecture
}


\vspace {.1in}
\noindent
{\bf Architecture:}
\vspace{.1in}
\begin{itemize}
\item register-to-register CRAY-compatible architecture
    (all CRAY software should run on this machine)

\item microcode driven emulator to emulate the CRAY X-MP
  instruction set.  
\item 64-bit scientific computer with
  pipelined, asynchronous functional units.  
\item multiple pipelined functional units.  
\item 45 nsec cycle time.  
\item 5 vector, 1 scalar, and an address calculation can execute concurrently.  
\item transfer rate from registers to functional units of up to 6 words/ clock cycle (1.07 Gbytes/sec).
\item 256 word buffer between memory and instruction decode
logic allows execution of one instruction per cycle (two
cycles for conditional branch).
\item supports flexible hardware chaining of functional units
  and memory references.
\end{itemize}

\vspace{.1in}
\noindent
{\bf Configuration:}
\begin{itemize}
\item 32, 64, 128, 256, 512, and 1000 Mbyte field-upgradable memory configurations
  with 4-16 banks.   
\item four ports to memory (like the CRAY X-MP, i.e., 2 vector loads and a store
can be going on at the same time.)
\item will interface to a front end, either VAX 11/780,
VAX 11/750, or Hyperchannel.
\item 2-10 programmable I/O channels, each
  with 16 Kbyte buffer and a transfer
rate of 20 Mbyte/sec.  Transfer rate of buffers to central
memory is 1 word/clock period (178Mbytes/sec).
\item DD-550 disk drive holds 550 Mbytes and can sustain
read/write data transfer rate of 10 Mbyte/sec with an
average access time (seek plus latency) of 24 msec
\item maximum of eight drives can be attached to each of the
eight optional I/O channels.
\end{itemize}


\newpage
\noindent
Other features:
\begin{itemize}
\item Size: 55 x 55 x 60 inches
\item Forced air cooling.
\item Power consumption: 208 3-phase 11-16.5 KVA
\item Weight: 1 ton
\end{itemize}

{\bf Software:}
\begin{itemize}
\item SCENIX (UNIX V5.3 compliant), SCS/COS and CTSS.
\item software licensing agreement with CRAY.
\item I/O and network connections performed by SCS I/O Network Nodes
    (IONNs) which have Direct Memory access to any SCS processor memory
    setting on the SCS 178 Mbyte network.
\item multiuser, multiprogramming OS supports interactive job execution.
\end{itemize}

{\bf Languages:}
\begin{itemize}
\item Fortran 77.
    Fortran compilation expected at 20,000 to 40,000 lines per minute.
    Fortran vectorizing compiler.
    Interactive debugger.
\item Assembler.
\item Vectorizing C compiler.
\end{itemize}

{\bf Applications:}
\begin{itemize}
\item MSC/NASTRAN
\item GAUSSIAN 86
\item ANSYS
\item ABAQUS
\item FIDAP
\item over 150 more applications ported from the CRAY X-MP.
\end{itemize}

{\bf Performance:}
\begin{itemize}
\item SCS-40/XM peak vector rate of 44 Mflops and peak scalar rate of
    22 mips in 64-bit arithmetic.
\item SCS-30/XM peak vector rate of 33 Mflops and peak scalar rate of
    16 mips in 64-bit arithmetic.
\item LINPACK timings around 1/4 the performance of a single CPU X-MP.
\item Matrix vector operations (subroutine SMXPY).
 \item around 37.6 Mflops (simulated).
\end{itemize}

\vspace {.1in}
\noindent
{\bf Status:} Prototype available 11/85; first customer shipment 4/86

\vspace {.1in}
\noindent
Cost: Base system \$295,000.

\vspace {.1in}
\noindent
Market target is to provide a CRAY-compatible general-purpose
scientific computer that computes at 1/4 the CRAY X-MP, but has the
price of a super-mini and thus the price/performance of a
supercomputer.


\vspace {.1in}
\noindent
{\bf Contact:}
\vspace{.1in}
\begin{flushleft}
Scientific Computer Systems\\
10180 Barnes Canyon Road\\
San Diego, CA 92121\\
619-546-1212\\

\vspace {.1in}
President: Barry Rosenbaum\\

\vspace {.1in}

Pierre Hassid\\
Scientific Computer Systems Corporation\\
5 Villa Alexandrine\\
92100 Boulogne Billancourt\\
France\\
+33-1-48.25.73.47\\
\end{flushleft}

.