<s>
The	O
T3D	B-Device
(	O
Torus	O
,	O
3-Dimensional	O
)	O
was	O
Cray	O
Research	O
's	O
first	O
attempt	O
at	O
a	O
massively	B-Operating_System
parallel	I-Operating_System
supercomputer	B-Architecture
architecture	O
.	O
</s>
<s>
Launched	O
in	O
1993	O
,	O
it	O
also	O
marked	O
Cray	O
's	O
first	O
use	O
of	O
another	O
company	O
's	O
microprocessor	B-Architecture
.	O
</s>
<s>
The	O
T3D	B-Device
consisted	O
of	O
between	O
32	O
and	O
2048	O
Processing	O
Elements	O
(	O
PEs	O
)	O
,	O
each	O
comprising	O
a	O
150	O
MHz	O
DEC	O
Alpha	B-General_Concept
21064	I-General_Concept
(	O
EV4	O
)	O
microprocessor	B-Architecture
and	O
either	O
16	O
or	O
64	O
MB	O
of	O
DRAM	O
.	O
</s>
<s>
The	O
T3D	B-Device
was	O
designed	O
to	O
be	O
hosted	O
by	O
a	O
Cray	B-Device
Y-MP	I-Device
Model	O
E	O
,	O
M90	O
or	O
C90-series	O
"	O
front-end	O
"	O
system	O
and	O
rely	O
on	O
it	O
and	O
its	O
UNICOS	B-Operating_System
operating	B-General_Concept
system	I-General_Concept
for	O
all	O
I/O	O
and	O
most	O
system	O
services	O
.	O
</s>
<s>
The	O
T3D	B-Device
PEs	O
ran	O
a	O
simple	O
microkernel	B-Operating_System
called	O
UNICOS	B-Operating_System
MAX	O
.	O
</s>
<s>
Several	O
different	O
configurations	O
of	O
T3D	B-Device
were	O
available	O
.	O
</s>
<s>
The	O
Cray	B-Device
T3D	I-Device
MC	O
cabinet	O
had	O
an	O
Apple	O
Macintosh	B-Device
PowerBook	I-Device
laptop	O
built	O
into	O
its	O
front	O
.	O
</s>
<s>
Its	O
only	O
purpose	O
was	O
to	O
display	O
animated	O
Cray	O
Research	O
and	O
T3D	B-Device
logos	O
on	O
its	O
color	O
LCD	O
screen	O
.	O
</s>
<s>
The	O
first	O
T3D	B-Device
delivered	O
was	O
a	O
prototype	O
installed	O
at	O
the	O
Pittsburgh	O
Supercomputing	B-Architecture
Center	O
in	O
early	O
September	O
1993	O
.	O
</s>
<s>
The	O
supercomputer	B-Architecture
was	O
formally	O
introduced	O
on	O
27	O
September	O
1993	O
.	O
</s>
<s>
The	O
T3D	B-Device
was	O
superseded	O
in	O
1995	O
by	O
the	O
faster	O
and	O
more	O
sophisticated	O
Cray	B-Device
T3E	I-Device
.	O
</s>
