<s>
The	O
Cray	B-Device
J90	I-Device
series	O
(	O
code-named	O
Jedi	B-Application
during	O
development	O
)	O
was	O
an	O
air-cooled	O
vector	B-Operating_System
processor	I-Operating_System
supercomputer	B-Architecture
first	O
sold	O
by	O
Cray	O
Research	O
in	O
1994	O
.	O
</s>
<s>
The	O
J90	O
evolved	O
from	O
the	O
Cray	B-Device
Y-MP	I-Device
EL	I-Device
minisupercomputer	B-Device
,	O
and	O
is	O
compatible	O
with	O
Y-MP	O
software	O
,	O
running	O
the	O
same	O
UNICOS	B-Operating_System
operating	B-General_Concept
system	I-General_Concept
.	O
</s>
<s>
The	O
J90	O
supported	O
up	O
to	O
32	O
CMOS	B-Device
processors	O
with	O
a	O
10	O
ns	O
(	O
100	O
MHz	O
)	O
clock	O
.	O
</s>
<s>
It	O
supported	O
up	O
to	O
4	O
GB	O
of	O
main	O
memory	B-General_Concept
and	O
up	O
to	O
48	O
GB/s	O
of	O
memory	B-General_Concept
bandwidth	O
,	O
giving	O
it	O
considerably	O
less	O
performance	O
than	O
the	O
contemporary	O
Cray	B-Device
T90	I-Device
,	O
but	O
making	O
it	O
a	O
strong	O
competitor	O
to	O
other	O
technical	O
computers	O
in	O
its	O
price	O
range	O
.	O
</s>
<s>
All	O
input/output	O
in	O
a	O
J90	O
system	O
was	O
handled	O
by	O
an	O
IOS	O
(	O
Input/Output	O
Subsystem	O
)	O
called	O
IOS	O
Model	O
V	O
.	O
The	O
IOS-V	O
was	O
based	O
on	O
the	O
VME64	B-Architecture
bus	O
and	O
SPARC	B-Architecture
I/O	O
processors	O
(	O
IOPs	O
)	O
running	O
the	O
VxWorks	B-Operating_System
RTOS	B-Operating_System
.	O
</s>
<s>
The	O
IOS	O
was	O
programmed	O
to	O
emulate	O
the	O
IOS	O
Model	O
E	O
,	O
used	O
in	O
the	O
larger	O
Cray	B-Device
Y-MP	I-Device
systems	O
,	O
in	O
order	O
to	O
minimize	O
changes	O
in	O
the	O
UNICOS	B-Operating_System
operating	B-General_Concept
system	I-General_Concept
.	O
</s>
<s>
By	O
using	O
standard	O
VME	B-Architecture
boards	I-Architecture
,	O
a	O
wide	O
variety	O
of	O
commodity	O
peripherals	O
could	O
be	O
used	O
.	O
</s>
<s>
The	O
scalar	O
chip	O
was	O
also	O
notable	O
for	O
including	O
a	O
small	O
(	O
128	O
word	O
)	O
data	B-General_Concept
cache	I-General_Concept
to	O
enhance	O
scalar	O
performance	O
.	O
</s>
<s>
Support	O
was	O
also	O
added	O
for	O
the	O
GigaRing	O
I/O	O
system	O
found	O
on	O
the	O
Cray	B-Device
T3E	I-Device
and	O
Cray	B-Device
SV1	I-Device
,	O
replacing	O
IOS-V	O
.	O
Later	O
,	O
SV1	B-Device
processors	O
could	O
be	O
installed	O
in	O
a	O
J90	O
or	O
J90se	O
,	O
further	O
increasing	O
performance	O
within	O
the	O
same	O
frame	O
.	O
</s>
