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{\bf
Unisys Integrated Scientific Processor System ISP 1100/90
}

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{\bf
Vector Parallel Architecture
}

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\noindent
{\bf Architecture:}
Heterogeneous processing system - up to four processors (IPs), two of
which can be vector processors (ISPs). A completely integrated system.
LSI and MSI integration scale ECL logic is used.
The ISP has independent scalar modules (SM) and a vector module (VM)
with a multiply, and add, and a move pipe and 16 vector registers, each
holding 64 integers, 64 single precision floating-point numbers
(36-bit), or 32 double precision floating-point numbers. The clock
cycle time is 30 nsec. The SM and VM
share a local cache of 4 Kwords with a one cycle access time. The cache
is principally used by the SM although the VM can address into the
cache. Hardware gather/scatter is supported. The
operating system will run on the IPs in parallel with computation on
the ISPs.

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There are up to 16 Mwords (36-bit words) of memory available in
increments of 4 Mwords.
Memory is interleaved with a bank size of
.5 Mwords and a bank cycle time of 90 nsec.
The peak transfer rate from memory to an ISP is
133 Mwords/sec.
This main memory is termed the Scientific
Processor Storage Unit (SPSU).

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{\bf Configuration:}
A basic Integrated
Scientific Processing system
consists of a Unisys 1100/90 CPU with
one I/O Unit, the ISP, and a 4 Mwords SPSU.

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{\bf Software: }
OS/1100 and UNIX available.
Vectorizing compiler UFTN with symbolic debugger, many 8x extensions,
and fork/join parallelization primitives.
A program execution evaluation routine (PEER) is available.
Common Math Library includes functions like SIN and COS.
Extended Math Library includes BLAS, LINPACK, EISPACK, and FFTs.

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{\bf Performance:} 
The peak performance of a single ISP is 133 Mflops in single
precision (36-bit word) and 67 Mflops in double precision (72-bit
word).
The sustained performance is 20 to 30 Mflops in double precision and may double
for single precision.

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{\bf Status:}
First delivery was June 1986.

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{\bf Contact:}
\begin{flushleft}
Dave Deak\\
Unisys Corporation\\
Information Systems Group\\
P.O. Box 500\\
Blue Bell, PA  19424\\
215-542-5216\\

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