<s>
gravitySimulator	B-Device
is	O
a	O
novel	O
supercomputer	B-Architecture
that	O
incorporates	O
special-purpose	O
GRAPE	B-Device
hardware	O
to	O
solve	O
the	O
gravitational	O
n-body	O
problem	O
.	O
</s>
<s>
The	O
computer	O
consists	O
of	O
32	O
nodes	O
,	O
each	O
of	O
which	O
contains	O
a	O
GRAPE-6A	O
board	O
(	O
"	O
mini-GRAPE	O
"	O
)	O
in	O
a	O
Peripheral	B-Protocol
Component	I-Protocol
Interconnect	I-Protocol
(	O
PCI	B-Protocol
)	O
slot	O
.	O
</s>
<s>
The	O
GRAPE	B-Device
boards	O
use	O
pipelines	O
to	O
compute	O
pairwise	O
forces	O
between	O
particles	O
at	O
a	O
speed	O
of	O
130	O
Gflops	O
.	O
</s>
<s>
The	O
on-board	O
memory	O
of	O
each	O
GRAPE	B-Device
board	O
can	O
hold	O
data	O
for	O
128,000	O
particles	O
,	O
and	O
by	O
combining	O
32	O
of	O
them	O
in	O
a	O
cluster	O
,	O
a	O
total	O
of	O
four	O
million	O
particles	O
can	O
be	O
integrated	O
,	O
at	O
sustained	O
speeds	O
of	O
4Tflops	O
.	O
</s>
<s>
gravitySimulator	B-Device
is	O
used	O
to	O
study	O
the	O
dynamical	O
evolution	O
of	O
galaxies	B-Application
and	O
galactic	O
nuclei	O
.	O
</s>
